Malicious PDF — malware analysis report

Static analysis result for SHA-256 178efc7dbb8a2512…

MALICIOUS

PDF

87.4 KB Created: 2021-03-28 11:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 049b962c9631b5188be93ef252202e3a SHA-1: dcccf2b32d3fb4fa24b03660206fbfad64271652 SHA-256: 178efc7dbb8a2512ad364d153b57d5f03dbf6338d5650791516ce65fad6aa57d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms used in phishing or malware distribution campaigns. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of links pointing to potentially malicious domains. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/wix?keyword=how+to+get+rid+of+ghost+shrimp PDF link annotation
    • http://moviesaddaa.online/sejofapadow36iga.pdfIn PDF document text
    • http://usesoda.pro/rezamawozivosi834oy.pdfIn PDF document text
    • http://letxxnx.org/wifuteluwitogakokabazaralqs3wn.pdfIn PDF document text
    • http://kartaidatodemeleri.com/20326416905mhsoi.pdfIn PDF document text
    • http://smartcoin.design/b_cn_ngha_l_gv187j.pdfIn PDF document text
    • http://lestyprin.online/how_much_pine_sol_to_disinfect_laundrydr3cx.pdfIn PDF document text
    • http://yatvoyya.fun/rigoponajapenofosofefobep030j.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/how_to_remove_a_stuck_water_filter_from_a_samsung_refrigeratord85ji.pdfIn PDF document text
    • http://shimano-stradic.ru/reading_the_world_ideas_that_matter_with_2016_mla_updatefz6pb.pdfIn PDF document text
    • http://chambrehub.xyz/average_digital_marketing_manager_salary_uktpnyj.pdfIn PDF document text
    • http://chebsvet.ru/excel_guitar_tablature_templatevbv9z.pdfIn PDF document text
    • http://zhigina.ru/54214498476z5ine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_2e30a0db9653419f98f938d65b8a2e7f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88774d71-b748-4a0e-a4a9-901425b6d237/how_to_download_inkscape_on_chromebook.pdfIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_28df1bbaaea84883b846c9486bdc4f34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b831364b-e4fd-4819-aad4-11370df9abb5/26592930163.pdfIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_22687f06816d448e9c99a6e6d78dd274.pdf?index=trueIn PDF document text
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_c8a65665a2f847e89b8434594517e693.pdf?index=trueIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_05ba4cbdb26140d9a406c2f0324007d6.pdf?index=trueIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_b40bf936800246beb7dbd4aa97353715.pdf?index=trueIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_7d27d06dc86b4061825e7dac95d150a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d307f05-410e-4bf7-b8fa-15ac6f187a79/how_to_fix_a_samsung_galaxy_tab_4_charging_port.pdfIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_25028c1a048f4cdb969363b6c4a3f462.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9791b57c-d365-45a6-a34d-6afa8bad53a3/20939381932.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11601 5264 bytes
SHA-256: 0d59b4d92d531422c182d1368ae29ef7f38c0753b6e96319de569c53a1cd7c4a
font_01_sfnt_off000127df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DF 11692 bytes
SHA-256: 23c73c8a98852140ecdde6b7b94e8839f2ce074bbdcb3b959e20923e39b6376f

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