Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a6f89f5104f1e7…

MALICIOUS

PDF

94.2 KB Created: 2021-04-02 16:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8a9c25a9dfdf4b84b15d7e84f7dce9ae SHA-1: 30a8ece8a29ef51ba19ddf417b6a2d6adee25ec1 SHA-256: 62a6f89f5104f1e773d76ac926189d0c5c91d3099fc1caa47388d5b2ca3ec14f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/award?keyword=amaravati+kathalu+pdf+file+free+download PDF link annotation
    • https://birifebirox.weebly.com/uploads/1/3/3/9/133999865/8355386.pdfIn PDF document text
    • http://muzoc.xyz/rc_race_tracks_in_grand_rapids_mitx92a.pdfIn PDF document text
    • http://gk-kuban.ru/batman_the_dark_knight_returns_part_2_batman_vs_jokersmsc9.pdfIn PDF document text
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/6edd14.pdfIn PDF document text
    • https://cdn.sqhk.co/goxejake/jhgdlhc/64874734345.pdfIn PDF document text
    • http://onlinetyz.xyz/twitter_stock_price_today5k7bf.pdfIn PDF document text
    • http://fastpeysistem.online/what_is_dbt_in_medical_termsoln4t.pdfIn PDF document text
    • http://copyrightnotice-ig.com/yoga_positions_names_in_englishuz41o.pdfIn PDF document text
    • http://drive4mclanemilwaukee.com/the_tattooist_of_auschwitz_book55njb.pdfIn PDF document text
    • http://flathead.us/micrometer_screw_gauge_simulation6jpbl.pdfIn PDF document text
    • https://tekevifumufov.weebly.com/uploads/1/3/0/7/130739519/dukudeg-namezavemiwowa-magolojevo.pdfIn PDF document text
    • http://presentinsta.online/3210948833zpz2f.pdfIn PDF document text
    • https://cdn.sqhk.co/kewexezaviz/jbDgeSk/conversion_temperature_worksheet.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/454_namahana_st_4017cp3u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ae051a-e7f3-43cd-b0c9-130e4863dae9/roruwotogixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60fd588a-8382-4626-b167-f35837be0c1a/97636926013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee648ed-5b0a-49b4-8a6f-5ff5a1f04bfd/dotesuzosupoxasunobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4293ff-d670-449c-b2d6-1380e197e8fc/fenerisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddebf073-2e53-4e8f-892c-e559a932a64e/subway_surfers_hile_indir_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b9463f6-7706-485d-8e0d-9d0c1e3740a9/monsterverse_movies_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d78e66-cf8c-42dd-b909-ad6149007e1a/what_jobs_can_you_get_with_communication_disorders_degree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96fca1e9-6e59-42fd-8054-1128633ce34d/what_is_the_stanza_structure_of_a_poem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/582f72f9-87e2-40a1-abcd-aa4c56748540/46421323635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6976836-3528-4c3f-a965-98125eb64104/34398104548.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 5308 bytes
SHA-256: 7e8cbe566040e0cd665d015990a17d69bbf1587965dedb9794d88c1b8ec88956
font_01_sfnt_off0001025b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 5892 bytes
SHA-256: f76fd3cdf5afa7fc290fbfd9adc51765e391fe9b60542704a2fc6199bd52a574
font_02_sfnt_off0001176d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176D 5288 bytes
SHA-256: 9f9805cedde795fde2a7b37ea705f7d496b63047b9bb925691d4bb81022aa857
font_03_sfnt_off000128c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C5 11400 bytes
SHA-256: 197576a8f01b6d51280ce95597643f5e93ffb5ba13ed64c63347ed8982ac5d4a
font_04_sfnt_off00014dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC1 18000 bytes
SHA-256: 43d8c85e5561e1ef0c1bf5e133e82479cf58d6b34a4e7e47c2f1e97c9a553a12