Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6c804a2bac5d5e…

MALICIOUS

PDF

94.9 KB Created: 2021-02-15 22:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fb4fc8e827207e484a59787ad573dc3c SHA-1: 80b93175c9bd43ea92a37a9eae12d059a89c656b SHA-256: fc6c804a2bac5d5ec14fd787a65167fce310a35bec015079e296b138afef85e4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://crophysi.ru/123?utm_term=11+22+63+netflix+canada PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374852/normal_6026185509279.pdfIn PDF document text
    • http://bevatijiwavefad.22web.org/video_title_animation_software_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375509/normal_601c6287da15b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417327/normal_60057634ddbd2.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/ihijjfD/xomuxozibafulam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469633/normal_6003d7284a67e.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/iTojijc/us_conflict_minerals_rule.pdfIn PDF document text
    • https://cdn.sqhk.co/texirova/jhD5ghX/app_lock_download_android_version_2._3._6.pdfIn PDF document text
    • http://furafofuvobomu.22web.org/html5_template_best_practices.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376380/normal_5fc700ca52aab.pdfIn PDF document text
    • https://cdn.sqhk.co/jomurozop/XgcUobT/kuvifobupawixa.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/hhgngfg/did_you_know_facts_with_pictures.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406777/normal_5ff55eb30b1ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://patesosiw.epizy.com/kebobisimigitenakozorojas.pdfIn PDF document text
    • http://vunowowino.epizy.com/gatifuralatov.pdfIn PDF document text
    • http://terefikug.epizy.com/kodawadepobijesuzizelapax.pdfIn PDF document text
    • http://nanolato.rf.gd/characteristics_of_civilization_worksheet.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_off000134ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EE 5216 bytes
SHA-256: 3dee7230ca06347bff9547efbd875279b1195988f0c16db75bc774abdfda2cb3
font_01_sfnt_off000146cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146CD 12112 bytes
SHA-256: 998a83101c6459c9e0211e25f0aafed48a039e796f29deeb30be60635c1e719b

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