Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32033859590ab6c…

MALICIOUS

PDF

74.7 KB Created: 2021-06-13 16:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: de0cc2192eabb913e99d0e50ffec4e46 SHA-1: 74d8bcd7fdf7878ea5b093a3c61b91e86a30ef84 SHA-256: f32033859590ab6c7389ff9b3206c1fd01d467827cd54a4ab844e4bc15381200
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a tactic of directing users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/pbw?utm_term=chapter+15+lymphatic+system+and+immunity+answers PDF link annotation
    • https://gagemixe.weebly.com/uploads/1/3/5/2/135295047/7221874.pdfIn PDF document text
    • https://fasexonepagi.weebly.com/uploads/1/3/0/9/130969542/5301548.pdfIn PDF document text
    • https://noruvejepemapab.weebly.com/uploads/1/3/4/7/134702548/8456106.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448126/normal_5fe019d701ed2.pdfIn PDF document text
    • https://xawewidijaxiju.weebly.com/uploads/1/3/4/2/134266046/bizotu.pdfIn PDF document text
    • https://wopaxosidavi.weebly.com/uploads/1/3/4/7/134732603/wulunad_nixegerom.pdfIn PDF document text
    • https://gokajafiwewafij.weebly.com/uploads/1/3/4/3/134314986/26a356b5aca732a.pdfIn PDF document text
    • https://lirobepofuneve.weebly.com/uploads/1/3/0/7/130740173/5516255.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482645/normal_5ff68baa75a64.pdfIn PDF document text
    • https://wikifezetusu.weebly.com/uploads/1/3/5/3/135306480/82271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484618/normal_5fe4e5e72d358.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425217/normal_5fe31a5b4a53b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383577/normal_6008faae080c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465127/normal_5fef162fa6a53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365586/normal_6001cfe45928f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_600fcae83046f.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/35e1649d-8045-4873-afd1-fb5b74e1efc8/kewavetegotal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b5b2467-b151-4782-a46e-b06d8f7c491c/4613910247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccfe6c27-365f-460f-8103-d5ce36f5e0bc/wovopidipokiwewabexuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01460e73-494c-4766-a447-8be44db238e5/69479070096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7953e6-167d-45b3-8943-8738802c6e12/spanish_speaking_countries_worksheet_packet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42258d10-8a32-4ea2-b6e1-826950d3fd54/vokuselagadozigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f747b2f6-6405-4e4c-a490-b137c3cd29e0/75408533753.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28d573dc-189b-486f-a182-454ab4d2c169/comentario_biblico_de_lucas_john_macarthur.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_off0000e710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE710 5588 bytes
SHA-256: 8269de2f8dd7c398893276dbbcbb3d031091efcc1f511444b503b52bda14d3b4
font_01_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 10384 bytes
SHA-256: b1522870e9d64ef38851ef6f5a6739f8109b78e7e76aa168e07595c12d161844

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