Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a897caedec6049f…

MALICIOUS

PDF

80.3 KB Created: 2021-04-06 04:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4be10900de72cbdb2e12aaf661a1622e SHA-1: 09ecf6dd13cbc13bbdfd356a57f37f3fc53ad1c7 SHA-256: 0a897caedec6049f3936493963a5932866f70d9c88d3b0d27da77a93860ebe8f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://yafferge.ru/award?keyword=virginia+eubanks+automating+inequality+pdf'. The ClamAV detection and ML classifier further support the malicious nature of this document, likely intended to phish or redirect users to malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=virginia+eubanks+automating+inequality+pdf In PDF document text
    • https://cdn.sqhk.co/faxixuwako/0ofoVrP/hd_pinball_machines_near_me.pdfIn PDF document text
    • http://posurazatux.mypressonline.com/canara_bank_account_opening_application_form.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxevabuvix/eFCiefR/mad_planets_video_game.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/defipedibe/61737817571.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/punatedogidisekeziv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aec42c41-4cee-4c1a-b94d-04ae346424a1/8946724057.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/why_cant_i_hear_sound_on_my_turtle_beaches.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/49614486683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c625dd-06a7-470f-ad8c-b10655dd91b5/78008724517.pdfIn PDF document text
    • http://zaxuzut.atwebpages.com/apple_mac_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/40496479978.pdfIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_1c7bc218ad3e4322964e9a2c0bcf535e.pdf?index=trueIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_d1f28002db304bc190002c4863e9b73d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wefadep/57744282047.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/16684575539.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_77485b55bd57447aadc5e3644b58f19c.pdf?index=trueIn 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_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 5756 bytes
SHA-256: a46d96505435f1c475b59cf9f2bb06a96a7c921ec3742f5c57466a8ff3a12cd1
font_01_sfnt_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 11028 bytes
SHA-256: a261d1ba901870cdc09a93b947963e45b37b062d6ecbc460bb89ba0d8d144e8f

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