Malicious PDF — malware analysis report

Static analysis result for SHA-256 97971fd4a7dd9949…

MALICIOUS

PDF

75.5 KB Created: 2021-06-07 15:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3bc6e12b4e4ad616ff0ecaab58516d3f SHA-1: 5dccc3f8dfe69a4a34244163e611ee06284d9405 SHA-256: 97971fd4a7dd9949d381091b3108d783a1714989ee4249cbeb9073fb5f4e45d8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/pbw?utm_term=nhs+podiatry+self+referral+form+leicester PDF link annotation
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/jepojomepapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_601a478feecd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418579/normal_60281dc48b829.pdfIn PDF document text
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/39196616b.pdfIn PDF document text
    • https://mifitulu.weebly.com/uploads/1/3/4/5/134521308/lufole_xezerebapof_pukote.pdfIn PDF document text
    • https://jasitonil.weebly.com/uploads/1/3/4/0/134096785/7694891.pdfIn PDF document text
    • https://fevapeju.weebly.com/uploads/1/3/4/4/134468187/fodawir-xubuwaxogu-sufunafegolane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ef6865-bc88-4d6c-b535-68952aa28861/python_interview_questions_in_tcs.pdfIn PDF document text
    • http://mitamugukojo.pbworks.com/w/file/fetch/144673059/84787994469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2783811-d274-434d-9d99-fe228e3727cf/what_should_you_feed_a_labrador_puppy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/034b3dc6-12fa-4cc7-96df-047bf4aba919/14252977391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a320f3-d012-4405-9060-b6f5cad89633/us_navy_seals_symbol.pdfIn PDF document text
    • http://godekazonigi.pbworks.com/w/file/fetch/144431742/valuation_sur_le_prsent_de_lindicatif_cm2.pdfIn PDF document text
    • http://godekazonigi.pbworks.com/w/file/fetch/144750069/calculating_net_forces_examples_worksheet_answers.pdfIn PDF document text
    • http://dawijunegolo.pbworks.com/w/file/fetch/144795762/renowis.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_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 5464 bytes
SHA-256: 7a1326e7f50352ea501e59edfffa0145125d3e0a695917202e353df04f7e4522
font_01_sfnt_off0000fb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 11172 bytes
SHA-256: da5559f8e2a5a850d28521b5eed3eb5ec399ff304c4e44438a55add9a357c9b7

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