Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7292e0137c69ac4…

MALICIOUS

PDF

104.8 KB Created: 2021-06-04 07:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c1fb297345af847fa56593d21a0ad0a1 SHA-1: dc93e113dc5303a11174b82618d810b763e45af4 SHA-256: b7292e0137c69ac4fe318bff571273c50f3c04bd133ac14f33517764ac79726b
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://catamma.ru/pbw?utm_term=what+famous+baseball+players+wore+number+79 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408720/normal_600bf05c2d223.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5fcc9ff3265fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473616/normal_60114729aa203.pdfIn PDF document text
    • https://gifoxulexup.weebly.com/uploads/1/3/4/8/134865115/505864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392652/normal_5fdc14c300aa9.pdfIn PDF document text
    • https://pobogovowot.weebly.com/uploads/1/3/5/3/135323888/7778356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487631/normal_605280a5c71c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_6042d340e0ae2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480382/normal_606c2ae46747c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498971/normal_605021263ffba.pdfIn PDF document text
    • https://repiwolaz.weebly.com/uploads/1/3/1/3/131381539/4179590.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/7e6e6173-201d-4550-a68c-5afc79876e75/is_it_good_to_be_straightforward.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/cules_son_los_beneficios_de_tomar_cloruro_de_magnesio.pdfIn PDF document text
    • http://zeratuwolima.pbworks.com/f/gemilaxumasevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adcd14a0-7133-46a6-8593-2596e35bdfac/sotuf.pdfIn PDF document text
    • http://joraxakegeg.pbworks.com/w/file/fetch/144553809/why_my_logitech_headset_is_not_working.pdfIn PDF document text
    • http://mijatonevu.pbworks.com/w/file/fetch/144596691/www.bet9ja.com_old_mobile_page.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5C 5724 bytes
SHA-256: edc87480f103f6c867085dfa74c679f95da6a83180070a2b232aebc4da426178
font_01_sfnt_off00016ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ECC 11336 bytes
SHA-256: 60d2088b9ba4736c34cbcfd432fd211243f9b3eb62b7098ef3994b837d561545

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