Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ae1b2d8e9c8d2c…

MALICIOUS

PDF

79.2 KB Created: 2021-06-03 18:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 797a4032c9939be703b9cb566a415db4 SHA-1: 562297fff97fa5f7099d8d858ae1a537bf1aac5b SHA-256: c1ae1b2d8e9c8d2cabb454ff5a72e45f5842ad8ba2088d80993b2f14d031356a
186 Risk Score

Malware Insights

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

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 0.9994

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://pistant.ru/pbw?utm_term=ms+excel+formulas+for+interview+questions+and+answers PDF link annotation
    • https://kaxebovirufuj.weebly.com/uploads/1/3/4/3/134399635/182cb792.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471959/normal_5ffbc8587ce54.pdfIn PDF document text
    • https://sutikarojujo.weebly.com/uploads/1/3/4/3/134343437/raxenose-powijar.pdfIn PDF document text
    • https://jijubukaxujofi.weebly.com/uploads/1/3/4/8/134892288/fenomurupezeri.pdfIn PDF document text
    • https://talesana.weebly.com/uploads/1/3/4/8/134878252/d0491e15b31870a.pdfIn PDF document text
    • https://lefofikik.weebly.com/uploads/1/3/5/3/135316562/jabod-lukijon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473637/normal_5fe4eaf399ac0.pdfIn PDF document text
    • https://nonesuwenuvav.weebly.com/uploads/1/3/4/4/134400251/pabibanudusutil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467285/normal_5ff307efec48a.pdfIn PDF document text
    • https://jatazuleb.weebly.com/uploads/1/3/4/6/134662889/10164aa.pdfIn PDF document text
    • https://nojugebi.weebly.com/uploads/1/3/4/3/134321301/nepebi.pdfIn PDF document text
    • https://lajakobu.weebly.com/uploads/1/3/4/5/134599687/1504917.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/jidisudasadus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiliser.pbworks.com/w/file/fetch/144466383/10.snf_karmlarn_ayrlmas_test_sorular.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/059797e7-a548-4403-9414-8d9cf9ea516b/vectores_algebra_lineal_ejercicios_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59573bcf-3ffb-4d43-a975-ff21e69dc329/91761420169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6992c6-09f5-42bc-af28-d8cba486fc0c/ver_pelicula_online_voces_inocentes.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144563013/best_forex_scalping_ea_reviews.pdfIn PDF document text
    • http://junerew.pbworks.com/w/file/fetch/144518499/french_verb_conjugation_chart_rester.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df3f639a-af4e-4f2d-b1f5-716d41a5ee2f/the_best_american_essays.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8caadb-6da5-4fff-b113-8e331431a296/gugutafoba.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/w/file/fetch/144566760/kisevifasadonemaleturog.pdfIn PDF document text
    • http://luwivaj.pbworks.com/f/25666526843.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_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 5520 bytes
SHA-256: 6d0c2854d22233d7e62ba708626936e6e223df7ce9f654a874ae5a2543ef860f
font_01_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 10808 bytes
SHA-256: 986ffdabd010f5ed4d3921201cb544dc312bae4059d54224c5a2972bd30c7663