Malicious PDF — malware analysis report

Static analysis result for SHA-256 df75a5e2a45db813…

MALICIOUS

PDF

80.5 KB Created: 2021-06-01 11:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f277646c24696b3411aa0b53d1f6fe3e SHA-1: cebc551eb5f0d03c2920ab8756097386a48941e1 SHA-256: df75a5e2a45db8130cadf332ef333e367df86cf4c8794e5c8328026c7564273c
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ketchas.ru/pbw?utm_term=private+school+mod+sims+4+2019 PDF link annotation
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/xotesopitezigix.pdfIn PDF document text
    • https://zafovuzixo.weebly.com/uploads/1/3/4/5/134588091/wutugakojaveb-wabimuwu-dipebenod-vepilozaku.pdfIn PDF document text
    • https://vidasukesidi.weebly.com/uploads/1/3/4/7/134731400/992040.pdfIn PDF document text
    • https://gaditefu.weebly.com/uploads/1/3/2/7/132712385/2940920.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/lerida_roliw.pdfIn PDF document text
    • https://vimuzepujox.weebly.com/uploads/1/3/4/3/134368191/1086911.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381543/normal_5fee060d81349.pdfIn PDF document text
    • https://xowozasa.weebly.com/uploads/1/3/3/9/133999953/19ecd7b84.pdfIn PDF document text
    • https://tonulaluxi.weebly.com/uploads/1/3/4/0/134099082/vonimuded.pdfIn PDF document text
    • https://kajumosezu.weebly.com/uploads/1/3/4/7/134749214/8762500.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/nikeb.pdfIn PDF document text
    • https://dikejupovavobu.weebly.com/uploads/1/3/1/0/131069859/7fb2ec89725d2b.pdfIn PDF document text
    • https://totuseki.weebly.com/uploads/1/3/5/3/135322554/ee2fc7d2d47ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444104/normal_604339206b33f.pdfIn PDF document text
    • https://xakebugus.weebly.com/uploads/1/3/4/0/134018628/jovirevubi_fejipebukipaj_pibugifo_xotivapodoxuru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454051/normal_5fe1535f087db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_602b7957b0988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413980/normal_601d31d2e271e.pdfIn PDF document text
    • https://nodeseverew.weebly.com/uploads/1/3/5/3/135323512/8620164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477877/normal_5fdc365ee284d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_6016c5930ff21.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kufavuva.pbworks.com/f/exercices_corrigs_barycentre_premire_s.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/winiminugixukuw.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/modales_perfectos_ejercicios.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/how_do_i_find_world_war_1_service_records.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_off0000fb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4F 5812 bytes
SHA-256: 187cac08e7d8d270428724946ec0dc167cedd2f2514a862118862bc28f7c0b96
font_01_sfnt_off00010efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFA 11136 bytes
SHA-256: 27bd98652b04181c417c04dd3c63c23f1544c39d774119b685112b0feb6152ee