Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7a79bcd5e96ccb…

MALICIOUS

PDF

76.7 KB Created: 2020-12-23 07:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 155e8ee709da98eb9d428a87e58e0b40 SHA-1: 0bbe857230fbb375f56d10e49ba628218dd1ed1b SHA-256: 4f7a79bcd5e96ccbf8a57afd69602f47a562b9c5108c1ff47bc34c39e1271e73
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as a link farm, with a significant number of external links pointing to various domains, including disposable hosting. The primary malicious URL identified is trafffe.ru, which is likely used to redirect users to further malicious content. The ML classifier and ClamAV also strongly indicate maliciousness, consistent with a phishing or SEO-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/aws?utm_term=diana+build+guide+lol PDF link annotation
    • https://dapijapivabug.weebly.com/uploads/1/3/4/3/134338952/9b367aedb7784.pdfIn PDF document text
    • https://dumisoxi.weebly.com/uploads/1/3/4/6/134625223/8eb600756e.pdfIn PDF document text
    • https://vurofagulomefu.weebly.com/uploads/1/3/1/4/131452840/sixewanosapunu.pdfIn PDF document text
    • https://zafugetab.weebly.com/uploads/1/3/4/5/134502131/berukiledit.pdfIn PDF document text
    • https://zororoxuz.weebly.com/uploads/1/3/4/3/134309160/wirejuwewurewi.pdfIn PDF document text
    • https://nazivuwe.weebly.com/uploads/1/3/4/4/134452961/7666149.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/621938.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fcee117941bd0096f259d1f/t/5fd1ec5feeaf2774ac904194/1607593056947/best_distance_measurement_app_for_iphone.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4cc22affbf90a66037377/t/5fc802a5473a3b56d49c04c5/1606943398407/joboropupapejo.pdfIn PDF document text
    • https://s3.amazonaws.com/sodoxi/12583958020.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/ninja_turtles_apk_games.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/alternative_minimum_taxable_income_2018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 4660 bytes
SHA-256: e3402a909aba09af26246a69d16ad1c6971bdc2720f6591c3213602ff226ed00
font_01_sfnt_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 15376 bytes
SHA-256: d5d510deb9516f899b995ce2e941a9d025db8f06aae0ff2088e9e8be0541d833
font_02_sfnt_off000117db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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