Malicious PDF — malware analysis report

Static analysis result for SHA-256 47dbd3c178a86ebf…

MALICIOUS

PDF

73.0 KB Created: 2021-02-27 04:33:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e4cc5b23ffc747d68514baf6ad1344a2 SHA-1: 8796c09f01377b68fc3efb25a1a7f108bd6e5dc2 SHA-256: 47dbd3c178a86ebf97160134674f93c4d14c29072201c16c7f74c21439b67f2f
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 hosted on S3 buckets and Weebly, suggesting a link farm or redirection scheme. The primary URL, https://ponafet.ru/123, is associated with a phishing lure related to research paper proposals. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ponafet.ru/123?utm_term=how+to+write+a+research+paper+proposal+apa PDF link annotation
    • https://tuxibefogeja.weebly.com/uploads/1/3/4/3/134359070/ec87c9839.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480899/normal_5ffefba0661e1.pdfIn PDF document text
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/4773161.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/puvaz_xixik_linadoduso_fubalurez.pdfIn PDF document text
    • https://movalibixijol.weebly.com/uploads/1/3/2/6/132682530/549eb6.pdfIn PDF document text
    • http://egrn-order.online/rawuwosuginajejr25e.pdfIn PDF document text
    • https://sapefita.weebly.com/uploads/1/3/0/7/130776655/9f47a34afc33aa.pdfIn PDF document text
    • http://ubsvp.com/raxiretabifokoxufejif9eeq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_603576c2e2241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_6019a1d8a16fa.pdfIn PDF document text
    • http://rankingcoach-apps.com/analysis_of_why_we_crave_horror_moviestktpr.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/sepawi/67990213267.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/game_boboiboy_galaxy_offline_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/jedoziwujudovul.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/xijegixew.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/game_biohazard_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/california_earned_income_tax_credit_worksheet.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_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 5076 bytes
SHA-256: 8e70dd29d7b0be7e5d1086cdfe16a9e24f39f7a9b486344c949d1bf8c9076ce5
font_01_sfnt_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 10408 bytes
SHA-256: 058e91f280c4640ba95733531c9a95f74fc8048a3821202d7d2e6ac0018e28c3

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