Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfad75ec57e6ee1b…

MALICIOUS

PDF

70.2 KB Created: 2021-06-08 01:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3dc96f0f7828f66c92b364b8aaa7e90b SHA-1: a9bc07b953b954a6e22316ea7f4605095878bf87 SHA-256: dfad75ec57e6ee1b88028b8b4e8510bbf06c777be97c5bc79d2a3b8ac95f54ce
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-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://cructi.ru/pbw?utm_term=programa+para+convertir+documentos+de+pdf+a+word+gratis+en+espa%25C3%25B1ol PDF link annotation
    • https://jadomurujamum.weebly.com/uploads/1/3/5/3/135326923/3140066c4d9b44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419623/normal_6006633b0f252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425504/normal_606a38dcb6c14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496014/normal_6028b79ea0f02.pdfIn PDF document text
    • https://fudonorovivur.weebly.com/uploads/1/3/4/6/134665028/likukafofufi-nuwumarexi.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/naroniwidudera_jigajopofif_mebemidonutapi_jupix.pdfIn PDF document text
    • https://bejixetixozivi.weebly.com/uploads/1/3/4/4/134499198/3104fb87d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461786/normal_5febdd41bd4ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dejapitud.pbworks.com/w/file/fetch/144799437/58145137358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/893b9946-cfad-4cad-b51d-2c34053d48b5/why_do_accountants_use_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e47476fe-4f6b-4501-9209-19ac0cc29584/frantz_fanon_cognitive_dissonance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc35a554-c744-4cfb-accf-ac89c363d7e5/nec_phone_dsx_22b_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48012358-eff8-4d68-8236-43ac8eb61ced/la_culpa_es_de_la_vaca_resumen_por_capitulos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/422ac5e7-acde-48fb-8f55-c6fdc687ad6e/nimamu.pdfIn PDF document text
    • http://zipiwume.pbworks.com/w/file/fetch/144819423/tekken_7_psp_game_download_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1784ee7-3910-4007-a3de-37d3e0db9dba/xokiwedovute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e631baa4-ba3b-471d-bbe6-98cc24b7346a/do_esters_smell.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_off0000ce01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE01 5840 bytes
SHA-256: 3df8433caa89e67fff28a5fcc3e0124bed450d64d0ac32c5495374687f9bbbee
font_01_sfnt_off0000e1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A5 11992 bytes
SHA-256: 2756d11ec5e98728557583442b5bf3527408c9f94f0dabcd85f8c964a40e6682

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