Malicious PDF — malware analysis report

Static analysis result for SHA-256 0995d3290736984b…

MALICIOUS

PDF

87.4 KB Created: 2021-03-25 03:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1437754ea09542d6a0a35c5e129ed860 SHA-1: 97f8e4bb8d406dadbf583573e011d23f21f3ee3b SHA-256: 0995d3290736984b487448ec83c3cd28f2e682561460b7b9025cdd913f52bed8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also flag this PDF as malicious, specifically as a phishing trojan. The embedded URL `https://mezovuduw.ru/award?keyword=treatment+of+hepatitis+c+virus+pdf` suggests a lure related to medical information to entice users to click through.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/award?keyword=treatment+of+hepatitis+c+virus+pdf PDF link annotation
    • https://xobojurum.weebly.com/uploads/1/3/4/5/134599739/lujeg.pdfIn PDF document text
    • http://teachersaid.fun/is_up_tv_on_rokurc4ud.pdfIn PDF document text
    • https://latopilufazi.weebly.com/uploads/1/3/4/0/134017217/lenax_bakagupabu_mipile_bokele.pdfIn PDF document text
    • https://befojawukirafa.weebly.com/uploads/1/3/4/8/134855882/nirotetozaw.pdfIn PDF document text
    • http://regse.website/atls_manual_downloadn9jku.pdfIn PDF document text
    • http://fb-copyright-help-from.com/rogebajevuao9uj.pdfIn PDF document text
    • http://voirly.xyz/55247750257frgde.pdfIn PDF document text
    • https://kimidagox.weebly.com/uploads/1/3/4/4/134470984/ea15f77df46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/stihl_hs_45_hedge_trimmer_price.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/nivonojobamomuv.pdfIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_33893d70cbc04668816bdd3a1f39d566.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/tapulosaruliwoxavegati.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_d7ff3ad9c4e24876a485b27f94332b32.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_0b88ad7c389f4eb2ba372a3c8d653e72.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lawakux/pafezilulefejagevozixe.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_1c8fe03df04a4e46bf7c8ea6608cb92d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0297d5-0d11-42d0-ad8d-fcef9d912215/nlt_filament_bible_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4f789d-9b96-48f5-8941-1b669799ac0c/padi_open_water_final_exam_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/family_members_worksheet_grammar.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/economic_lesson_from_asian_tigers_japan_europe_and_america.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/78529684017.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 5372 bytes
SHA-256: 7dcf1e281939e478071f5d6a2115c46315f7d149a8df359fa714b4198773de74
font_01_sfnt_off000114eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 10784 bytes
SHA-256: 00bf5e73d5413beda24291e5cc7f275d1d8094fff1fce44ce269b6509cf26e66
font_02_sfnt_off000139e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E3 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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