Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2f186c2016d8f9…

MALICIOUS

PDF

82.2 KB Created: 2021-03-14 03:24:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f5da5339f35d440e827b7f5459a90ea7 SHA-1: d5e3e9372883e448901d889188ebb09f7d9e89c3 SHA-256: 6f2f186c2016d8f9f12ae55580899ea78b7f6d9de7532b2dd6a6d11b47b3ef4d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/award?keyword=bks+iyengar+yoga+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448985/normal_6004e4e35ed10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443356/normal_5feb5db86b09d.pdfIn PDF document text
    • http://rcasino.info/sena_20s_evo_motorcycle_bluetooth_headset_helmet_intercomi7eu8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495240/normal_5ff27f323804e.pdfIn PDF document text
    • http://kieverts.xyz/sibedetu7sy2p.pdfIn PDF document text
    • http://habercigo.com/78568947050uvklp.pdfIn PDF document text
    • https://paxexituva.weebly.com/uploads/1/3/5/3/135332474/8dd24e3470.pdfIn PDF document text
    • https://tujeliwavujojow.weebly.com/uploads/1/3/5/3/135304707/potoludasipoxo-ladomemubu-rafox-lepedozaz.pdfIn PDF document text
    • http://meblik.su/aloha_breeze_tower_fan_remote_control_replacement14uk4.pdfIn PDF document text
    • https://wexotagupoma.weebly.com/uploads/1/3/2/8/132814474/didivojenoxejede.pdfIn PDF document text
    • https://zunejafeg.weebly.com/uploads/1/3/4/3/134382709/52265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_60308cd5136ae.pdfIn PDF document text
    • http://rokuboxajiga.medianewsonline.com/synonymy_and_antonymy.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ninazarila/16594446525.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_1f13af8f44c547e3a7b03fff7b5dc0c6.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_b4b9c3be7a454ac88bd24c098ff0e86a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/different_kinds_of_homes_worksheet.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/32132456034.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/tent_groundsheet_halfords.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
stream_004_off0000fdb0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFDB0 6704 bytes
SHA-256: 79cc6969d28400a14ca6c4bcb625782d4a877ef205005528c15d7ff4b850adff
font_00_sfnt_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 5392 bytes
SHA-256: a025818f499718df3917da95ef5392f2940dfaaee8cc0765137e0ca95a5d894a
font_02_sfnt_off000112c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C0 11840 bytes
SHA-256: 071e177637a2024d629dfa5889ec265442957390f6b926b479ae01c71c953207

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