Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e7979c7e90893b…

MALICIOUS

PDF

77.7 KB Created: 2021-06-04 19:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: dbd76190db494ab4b3b198653b153333 SHA-1: 9ce6649f1057e3da9ada0c9c942dd5b338bc034e SHA-256: 80e7979c7e90893b32b52f4df05627e5f3c213d675ad95406f240fd955cc2fd2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the link farm suggest an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/pbw?utm_term=fire+exit+plan+template+free PDF link annotation
    • https://nizufijaduwetep.weebly.com/uploads/1/3/5/3/135309937/7292177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_6048cc2820948.pdfIn PDF document text
    • https://bajevopado.weebly.com/uploads/1/3/4/4/134456845/toxupebofaxu.pdfIn PDF document text
    • https://jewupoma.weebly.com/uploads/1/3/1/4/131437657/vuzowizenewogefafawe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367308/normal_5fce25b897ee0.pdfIn PDF document text
    • https://samibogamo.weebly.com/uploads/1/3/4/8/134883552/zaloru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476429/normal_600e0615f12bb.pdfIn PDF document text
    • https://viluxesoxumubi.weebly.com/uploads/1/3/1/4/131406714/4509733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457881/normal_5fe8104243329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495849/normal_603cbb1eb06fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416154/normal_5fdc1ad590faf.pdfIn PDF document text
    • https://xetutimi.weebly.com/uploads/1/3/0/9/130968997/bffd2.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/0e6bf78f-0f49-4ab7-9117-2582af840f7a/ejercicios_para_bajar_de_peso_en_casa_para_hombres.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b883df7-6ee7-4cd3-873c-6c65ba403df6/paropadomofevobok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a079158d-1f9b-4759-a143-66a0e162c8aa/ge_stackable_washer_dryer_dimensions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6de702-a407-48b8-ad91-d8fbf48331ed/the_architecture_of_happiness_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6742c23-c7b7-425c-ad2d-c8ec123f9d76/what_does_the_better_angels_of_our_nature_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53059fa9-edea-4d4c-91e7-50557613514c/79209727322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2d6b7ca-1e6a-476b-9dbc-12381341039c/bajavokizupunuf.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_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 4892 bytes
SHA-256: 5bc0f05d746aec74b1b1f6c4f375f0bc5a0eef018b971e6abcc328f40113fded
font_01_sfnt_off000104ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 10344 bytes
SHA-256: 9413d03878a8de1617b1ab8e7dad636dfbc3e306104b342f5e1c2cc5ac9ac5ba