Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b48820826f558ee…

MALICIOUS

PDF

69.7 KB Created: 2020-11-10 19:03:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d4241c2c53dbca341e5f74bd27bbfba SHA-1: cb1bff725497ad49114303539627ca5b4124ec88 SHA-256: 6b48820826f558ee69a6b0f88cf3c58e46722d85e1ca66ffe3bc0ba283bbbf24
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are designed to appear as legitimate documents but lead to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL identified is 'https://trafffi.ru/aws?keyword=gta+san+andreas+apk+full', which suggests a lure for downloading software. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?keyword=gta+san+andreas+apk+full
    • https://folanejo.weebly.com/uploads/1/3/0/7/130776558/tuluguf.pdf
    • https://cdn-cms.f-static.net/uploads/4402289/normal_5f9dcf9c5f9d5.pdf
    • https://xisobapujizutu.weebly.com/uploads/1/3/4/5/134585888/e724c8be4.pdf
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f9662e85060e.pdf
    • https://cdn-cms.f-static.net/uploads/4379377/normal_5f9b8ffc9da5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/028ba662-7023-4394-9975-f80243915ec3/gagusereliluvaruxepunaj.pdf
    • https://s3.amazonaws.com/daniwodug/farberware_air_fryer_manual.pdf
    • https://s3.amazonaws.com/jubiferekaka/our_solar_system_to_scale_video.pdf
    • https://uploads.strikinglycdn.com/files/f4f0dd23-c788-42ac-9071-cc61452ef4b1/tssaa_football_scores_2018.pdf
    • https://uploads.strikinglycdn.com/files/3a05deb4-24be-457f-9829-95a0143be5ad/fosumugorezebuv.pdf
    • https://uploads.strikinglycdn.com/files/8338e4b2-9bc3-4109-9096-5c21a55156cd/97999136568.pdf
    • https://uploads.strikinglycdn.com/files/7ea1ea29-f9af-4bcc-8500-0131a63284f6/5053707294.pdf
    • https://uploads.strikinglycdn.com/files/dd804895-5993-4ccb-a6ef-7c6770d305a5/72269314084.pdf
    • https://uploads.strikinglycdn.com/files/2c5f1abe-0360-4962-bf0c-68b25451e435/48187014816.pdf
    • https://uploads.strikinglycdn.com/files/221219d2-9c0b-4172-87c5-01dfe9cc262e/repuwosu.pdf
    • https://uploads.strikinglycdn.com/files/bad6756b-4b53-41e4-ac13-f5d3d9bd5bba/nezabegivanod.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d51d.bin
1dc23e1c9aa5fae65468d75954f536e751d9909ecefe389a331d4c39bfcdb902		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD51D 5132 bytes
font_01_sfnt_off0000e6ad.bin
75e980cbab5a1d99bc3db49a5ae4714eb1f14d3f67bbd29ac6bb17237c582a2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 10268 bytes

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