Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a241a9c895f670…

MALICIOUS

PDF

78.1 KB Created: 2021-04-07 12:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fe4b2b709122ad0323a5193153a47832 SHA-1: 206e43f58385a9b9b340b8f441d395d3ccfa2b53 SHA-256: c0a241a9c895f670c29908b2cc1bc597044064bf9cbe035d51cb3164f1ddc7a2
186 Risk Score

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 0.9993

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://leonvi.ru/aws?utm_term=in+a+dark+dark+room+movie PDF link annotation
    • https://cdn.sqhk.co/ragejeli/eRHfBjK/konifagopufit.pdfIn PDF document text
    • https://gozerivolese.weebly.com/uploads/1/3/4/2/134265833/memomebusej-lumurafibefid.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/bruchrechnung_addition_subtraktion.pdfIn PDF document text
    • https://cdn.sqhk.co/zalenemu/jigqT3y/28967528156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459034/normal_6019cbcd1a3f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447884/normal_604cdae7b896e.pdfIn PDF document text
    • https://jenitexul.weebly.com/uploads/1/3/4/8/134859983/1249161.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/AheQiac/homeschool_curriculum_reviews_5th_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464053/normal_5fd6458dbdc31.pdfIn PDF document text
    • http://dusamoka.mywebcommunity.org/2323710928.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480584/normal_5ffe9efa56789.pdfIn PDF document text
    • https://fafafupoxojamu.weebly.com/uploads/1/3/5/3/135350358/tewuwo-wekode-bakidoxezago.pdfIn PDF document text
    • https://kisujaxu.weebly.com/uploads/1/3/0/7/130775962/zuwesuxura_xixolasu_boxotoj.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/vxvq6hh/79815978379.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_12feec922b0441dca2bc1b7b2694ce42.pdf?index=trueIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_1d647f7b3c2b406e8f0122e6b6744456.pdf?index=trueIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_7d7586b781144f46a45434e167369bfa.pdf?index=trueIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_31f4173ca07a420b933614f1e8500b81.pdf?index=trueIn PDF document text
    • https://b23ebcb4-2e41-4c68-a408-584c84124782.filesusr.com/ugd/5a2446_d056cba110ed4bf59f3f45c35e5e7d97.pdf?index=trueIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_80cb5a5867f44bac961218d15961ed8c.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_392977456b874fc793524c580e1e9828.pdf?index=trueIn PDF document text
    • https://00f02ae0-031c-4cf4-85c3-86bbc6d7deb2.filesusr.com/ugd/13f2e4_1ac07e91afb049628fd6f128bc83ae6d.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_8793e459614d4d0aa813a06aa4359181.pdf?index=trueIn 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_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 4824 bytes
SHA-256: 4d93afd96ebf7547db4f22caf148d37be46af149391bb503f44ea9751599764a
font_01_sfnt_off0001070d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070D 10672 bytes
SHA-256: 5be847d1f16d912249675d61c50c395ab336cbfe749c257a8989e2182e0d856a