Malicious PDF — malware analysis report

Static analysis result for SHA-256 e119856082a921bf…

MALICIOUS

PDF

78.9 KB Created: 2021-04-25 21:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1f276aa996a98f772d678a4af149dbf9 SHA-1: 1420118eee2cc8e406da6b2ba88e4c86cabc257c SHA-256: e119856082a921bf21c0d67e77e389556adce0f8c346a68c27aafdb130afa1a1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDFs, suggesting a link farm or a distribution mechanism for further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the overall structure point towards a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=pioneer+vsx-524-k+firmware+update PDF link annotation
    • http://topsalon.xyz/29385230985a0agq.pdfIn PDF document text
    • http://myirn.icu/wawazaxomujowizusamatal44ma2.pdfIn PDF document text
    • http://tradebot.space/ballast_water_management_convention_2017bzaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444644/normal_604646128f4c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371004/normal_5fe4625104a8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466661/normal_60431e9d5d905.pdfIn PDF document text
    • http://susurrus.space/54449793344kbwnk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366630/normal_5ff7865d3556d.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/posaxugidut/puxaziguguparagibi.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/91121707438.pdfIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_98b0c8a1d9b0433aa4fe8560bd1c780e.pdf?index=trueIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_94ed891c7fa942c59972dcb1e1ee566b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/contemplate_meaning_in_persian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f49e366-1c90-49f8-9f85-3bb5cb9738fe/68227101101.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/tojutuv.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_3dc0832fe09f40b1a740f3aea6de688d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/11279357161.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/jopabemefilum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/956b48d9-d7a9-4b94-9856-a68ed7f470c8/godaddy_social_media_marketing_reviews.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_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 5816 bytes
SHA-256: 2e4dea6999da17ab2f6a4f78ceca4a7cf63e0051b2d3f6763e009f4cc680ef1c
font_01_sfnt_off000101b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 12932 bytes
SHA-256: 1eb8ec787b1af57d313afcb3228c309f037ecc06f36d12e32595e416567357d0

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