Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eead5e5ef8e8dd1…

MALICIOUS

PDF

90.6 KB Created: 2021-05-31 18:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5cdcb0b27424126ad0e12c8f27b77338 SHA-1: 1b170280181d975e69687afd5cabf40542fa765a SHA-256: 9eead5e5ef8e8dd107b6b9a319fb2f0fe39f99722160adf2bbbd23fb29571592
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 0.9997

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://coretry.ru/pbw?utm_term=what+can+i+say+to+my+niece+on+her+birthday PDF link annotation
    • https://tebozelekunoton.weebly.com/uploads/1/3/1/4/131453588/bipivuvax.pdfIn PDF document text
    • https://sabopedawexidix.weebly.com/uploads/1/3/4/3/134305122/2eb75c70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454543/normal_604604abb0d81.pdfIn PDF document text
    • https://zipijovef.weebly.com/uploads/1/3/4/6/134623752/zotejogelapezu.pdfIn PDF document text
    • https://vajawopi.weebly.com/uploads/1/3/4/5/134597817/sipawoxugonem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413238/normal_604c971b63000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_603e844821d8e.pdfIn PDF document text
    • https://xilanulutoras.weebly.com/uploads/1/3/4/0/134016814/divipufizolikire.pdfIn PDF document text
    • https://ragidogatekanex.weebly.com/uploads/1/3/4/3/134388076/2d54082.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/4dc79901-06bc-4c44-a6d2-252a33207caa/sitotojunafuresi.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/africas_hidden_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f877d198-b6b4-472e-8360-f7471e93798e/houghton_mifflin_harcourt_standards_practice_book_answers.pdfIn PDF document text
    • http://dekokos.pbworks.com/f/27863943868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3b0dfe-5881-4e7e-bc42-95b41e9a0790/zujebifaxipobu.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/85870395769.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144412662/54241097393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c7d2e78-ed02-4f72-b50f-2af765f6c638/south_carolina_drivers_manual_test.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCB 5400 bytes
SHA-256: 5135206129acdefb1b31f0e912cf4c73483bfb7ea578bb3449b5c6133295fdf4
font_01_sfnt_off00012f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F03 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00013791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13791 11000 bytes
SHA-256: 0fdc75a19772ec8c7e6296430dedbc236bcf0e7448f52cfd31c4338de296165f

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