Malicious PDF — malware analysis report

Static analysis result for SHA-256 353b7dcb11a83453…

MALICIOUS

PDF

77.2 KB Created: 2021-03-23 01:44:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 45ef402d094747f68cf0cc9db42ee765 SHA-1: 2246bab33ff3535761f0be4dfef1f3dcbdea2631 SHA-256: 353b7dcb11a83453df33cf794b9fb4efb2176c2520e8950c7af4d3c880061769
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain 'maypoin.ru' that is disguised as a product search result. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. No scripts were extracted, but the PDF structure and embedded links suggest a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/strik?utm_term=bosch+jigsaw+1587avs+blade+change PDF link annotation
    • http://fastcreditreport.info/rca_rcrn04gr_programming_codes7zqk0.pdfIn PDF document text
    • http://ionatr.space/munavujazowa5dbn1.pdfIn PDF document text
    • https://dekixemexiline.weebly.com/uploads/1/3/4/4/134497281/linowesaf.pdfIn PDF document text
    • http://zahlungsservice-ch.site/disaster_recovery_plan_template_small_business_ukjd6ur.pdfIn PDF document text
    • http://testertumentum.space/gumofiwekukibipaeeda.pdfIn PDF document text
    • http://naturagrush.space/7_strategies_for_wealth_and_happinesfvlrw.pdfIn PDF document text
    • https://masezinonorokun.weebly.com/uploads/1/3/4/6/134685416/wopunizatal-xapevefilowisi-piferevixamizib-wesido.pdfIn PDF document text
    • http://ses-paypal.com/zombies_zombies_zombies_full_movie_free_downloadbvcrm.pdfIn PDF document text
    • http://roskycnmx.com/zumapakimekufesasifurejudq6e5.pdfIn PDF document text
    • http://uchebnoe.website/50827593993zw8h6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/library_of_congress_sheet_music_catalog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/673c55d1-e344-4fbc-96db-2f19d7f87205/what_does_adrenaline_1_in_10000_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d8d2c9-a298-467a-b865-e6441d2cf744/texas_instrument_ti-30x_iis_exponents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a69409c5-7389-41ff-aa26-38a07c721aee/how_to_improve_your_memory.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/el_future_y_el_conditional_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/phthalic_anhydride_synthesis.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/wudaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf420590-6b68-47a1-ab30-e143bc2a1c25/vunanav.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FD 5972 bytes
SHA-256: f279c0645565c329bc41b502da0e3151c6866fc6430b6e92186fd1f070c95994
font_01_sfnt_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 11108 bytes
SHA-256: 2dbc9a724192b797b0a3799072a0b26a71034a5be0e346b52866a604c95a4282
font_02_sfnt_off000110ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AB 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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