Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c34892b2f969c0…

MALICIOUS

PDF

70.6 KB Created: 2021-03-20 20:02:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 26c76f93dc2e2e465d5062f4326a57e1 SHA-1: cb22878ccd3925431ec34c1dcd96689a71dacd00 SHA-256: 16c34892b2f969c03502553789845ea1576dfb1434dde1819efffa45fcd9fb2b
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 0.9998

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://xezojetit.ru/wix?keyword=unit+rates+involving+fractions+worksheet PDF link annotation
    • http://dabinepoj.mygamesonline.org/38258317989.pdfIn PDF document text
    • https://tiforunu.weebly.com/uploads/1/3/1/4/131437018/e9c4727a0405555.pdfIn PDF document text
    • http://jabudapitu.scienceontheweb.net/attestation_de_salaire_accident_de_travail.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465685/normal_603a783992731.pdfIn PDF document text
    • http://gukabibus.mygamesonline.org/98683830038.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/rent_agreement_in_marathi.pdfIn PDF document text
    • https://balejumefem.weebly.com/uploads/1/3/0/8/130814467/7e4cb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470961/normal_60431296903cb.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/47955751728.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tojuzogip.myartsonline.com/present_perfect_and_past_simple_exercises_autoenglish.pdfIn PDF document text
    • http://sajatuvireguta.atwebpages.com/vivigifivasipeneri.pdfIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_fbd6fcab7e4b4586987b8dec8fa1e634.pdf?index=trueIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_902a6901f5374a969348da80a7e15bf1.pdf?index=trueIn PDF document text
    • http://temodorofeg.atwebpages.com/brian_tracy_sales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5edbe598-4a60-42e3-848b-f1612ddea618/how_to_clean_jacuzzi_bath_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca669b5e-3a3a-4b14-a41e-72e200519813/introducing_christian_ethics.pdfIn PDF document text
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_56ea4b25f2034e4480775d4222724c1f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1decb7a6-10c7-41c6-b004-6a24dcfc1656/73848792740.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_off0000d51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51B 5348 bytes
SHA-256: a6f072467da6ff1370cf61025065d905d12ed69b679984f3fcb9d745d41aba46
font_01_sfnt_off0000e760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE760 11188 bytes
SHA-256: d361bed5480964075f8a80a332b6224425f2f3e805cb62dfd0b39ba24fd05492

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