Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc3ce813a10ca60…

MALICIOUS

PDF

140.4 KB Created: 2021-03-22 03:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e1f912cc2f6f3ed4a851a1c4274f1771 SHA-1: cec47e52ddc234de84ae63cb01c87a409ae49b06 SHA-256: dfc3ce813a10ca60f4fe2dfce450700d387aaeaecfd4acf275933b89fb4d5615
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. One prominent URL, "https://baarspo.ru/strik?utm_term=sandisk+sansa+clip+2gb+mp3+player+driver+download", indicates a lure related to downloading drivers, likely to deceive users into visiting malicious sites.

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://baarspo.ru/strik?utm_term=sandisk+sansa+clip+2gb+mp3+player+driver+download PDF link annotation
    • https://cdn.sqhk.co/givifevulo/dQXjhih/81858078822.pdfIn PDF document text
    • https://zupelewelasilag.weebly.com/uploads/1/3/4/5/134594614/8195733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_6011c1fea25a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461509/normal_60076f6a9a285.pdfIn PDF document text
    • https://cdn.sqhk.co/tirinakiweda/jdcXyij/73531370342.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/4ODggjs/telegram_web_series_channel.pdfIn PDF document text
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/jizin-kokezabujiro.pdfIn PDF document text
    • https://cdn.sqhk.co/wolowivem/HjiUiiH/makalah_bisnis_model_canvas.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/gjPDuSn/free_robux_promo_codes_no_verification.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446034/normal_5ffc88554a0dc.pdfIn PDF document text
    • https://rowegodidevonu.weebly.com/uploads/1/3/4/4/134468430/9aa0bce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/78687b27-44c6-4977-bc45-4cf20f3f9d79/poxatetizofowaluleduwil.pdfIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_c52033d4d67b4befbf08060a74683bdc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e222aa1-ea6a-4fb7-9f68-fe008c794778/cuanto_es_200_gr_de_mantequilla_en_tazas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b22b00-1162-4233-96c6-e753e4c20850/lejafufalefotoka.pdfIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_c7a231776e244cde8dd5ed16d1a5cc82.pdf?index=trueIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_b1f58ef7d3ea4b3aacf208a67dc0dd33.pdf?index=trueIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_cffd417d9fa546199c4d5c2ee0c4134a.pdf?index=trueIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_13825f2791ac4ba7be6583bae538c209.pdf?index=trueIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_1156892bcc494611bd1970689d8304fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea57fc69-d573-40ac-b870-de90951d5768/les_prophties_de_nostradamus_en_franais.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_off0001e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E747 6252 bytes
SHA-256: 9d94b97900d122c4ce34e7d240df3a8501acfac6f1531105716972ec01e57663
font_01_sfnt_off0001fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC84 11352 bytes
SHA-256: 1eebf839d21cdf9624444f49306a226c52027eeac430c6a6970a05d975b47169