Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b335c297c14c560…

MALICIOUS

PDF

74.0 KB Created: 2021-06-07 22:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0d4e03ff899c265b52913a96af7d0dd8 SHA-1: 9633e41904d18768d1b81b9bdb2586daaddf7f1d SHA-256: 5b335c297c14c5605e5f6b3bc2d06400d7c11f829792cfeaf5a920c75e70c902
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 0.9999

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://catamma.ru/pbw?utm_term=list+of+adjectives+with+meaning+and+examples+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417809/normal_6022baf344881.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460463/normal_5fe4e8c356674.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461773/normal_5fcd0b3b52148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_60b7b8c88c1da.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4449172/normal_60b3e8bf9b7e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413240/normal_60090d804dc8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417319/normal_60b899edad88a.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/c52793c4-589b-4520-8028-b99c0f6d4fc9/93308235557.pdfIn PDF document text
    • http://bijinim.pbworks.com/f/kewuvividirarolevixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6faf1faf-14e0-4dbe-aab5-c8622005ca3f/did_phoebus_love_esmeralda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f99a2721-2927-455e-b932-afc83105fcf7/champions_league_qualification_format_2020_21.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/144507687/how_to_get_past_act_1_in_hello_neighbor_hide_and_seek.pdfIn PDF document text
    • http://bilabegape.pbworks.com/w/file/fetch/144480267/chhota_bheem_and_krishna_kirmada_full_movie_cartoon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a738875c-3d01-4340-921a-167b7ae88920/xibewikitagajaguxuninuti.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/w/file/fetch/144735012/las_figuras_geometricas_para_primer_grado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1abfc54-7ef4-4332-87d2-aa54c4b38344/gorewut.pdfIn PDF document text
    • http://jowukon.pbworks.com/f/97435481031.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_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 5712 bytes
SHA-256: de9b66e46c422afa8f0a0742002d676f5c811dc48fe83f6f21b103672c1a196f
font_01_sfnt_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 10864 bytes
SHA-256: f5a5291f851bb30b108dc0e70c4cae486e580ce7f59c0d1f7eb6e4474f1eb93f

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