Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0db91d3c991725…

MALICIOUS

PDF

71.5 KB Created: 2021-06-07 04:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: be3bee255d83ff57a0a6d6e4dc513541 SHA-1: 958b6eadbd6e29b627507f2ecbc38eb9f8947235 SHA-256: 8f0db91d3c99172556ecd50915a772e09fef6f9740075642a2ccb16fe9fb26a3
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 0.9991

Heuristics 5

  • 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 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://pistant.ru/pbw?utm_term=what+is+the+turn+ratio+of+transformer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487625/normal_606250943321b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499341/normal_5fcf1b7a54d76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378379/normal_6005111703d31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409114/normal_60411456e2695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493602/normal_601403a11a201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420600/normal_60160adc08169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392647/normal_6063e83519fca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469837/normal_5fe939f232b04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489852/normal_60567db17a6ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_601eaa5917075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465255/normal_605f5c8b6730a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416791/normal_602173a9d127a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471106/normal_5fe6ac752e8bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481552/normal_605accd35dc7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450896/normal_5feccebe0ca53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483346/normal_603b02cba1c32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5fe1236dbae98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://minuwaxiper.pbworks.com/w/file/fetch/144630705/actividad_integradora_4_modulo_15_semana_2.pdfIn PDF document text
    • http://jetubabup.pbworks.com/f/caused_by_java.lang.outofmemoryerror_metaspace.pdfIn PDF document text
    • http://mijatonevu.pbworks.com/f/tevite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d6f936d-e1a2-407c-ba64-08a927490f89/lanokujubugevakak.pdfIn PDF document text
    • http://xovelezid.pbworks.com/w/file/fetch/144416778/what_is_the_average_salary_in_sri_lanka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d101b2e7-996c-457c-bd82-ea278b1291da/vesugokevepugi.pdfIn PDF document text
    • http://xizalow.pbworks.com/f/request_for_new_cheque_book_letter_format.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_off0000dbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB7 4988 bytes
SHA-256: ca917f69a285fc0df64e011bd12e3bf3f4cd92ad74915b6e113464b711c8dae5
font_01_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 10476 bytes
SHA-256: 565a3de633f294eef3f8bdb6e4e6b7f0823dc22ef84cfffd022f15416481ed05

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