Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74fc567b7f3ccc7…

MALICIOUS

PDF

71.8 KB Created: 2021-02-27 15:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f4275136ae6e2ce9eef0b8dfbd74ef2c SHA-1: d40438df11903a8f1f0ea0650aa867b1d8a68d47 SHA-256: a74fc567b7f3ccc7c2b1e5c522709e55d1f99a021e437872deff1b5f7132238a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with a primary focus on `https://ponafet.ru/wix?keyword=truyen+tieu+lam+ngan`, suggesting a phishing lure. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the phishing pretext.

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 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://ponafet.ru/wix?keyword=truyen+tieu+lam+ngan PDF link annotation
    • http://rumurel.mywebcommunity.org/prefix_and_suffix_worksheets_for_5th_grade.pdfIn PDF document text
    • http://idealica-tufficiale.website/5299860389464tpu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422135/normal_602e48ae662a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495858/normal_5fd7458f1249f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423732/normal_602d0eef25bfc.pdfIn PDF document text
    • http://svoytrylend.xyz/68067868401kuch2.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/how_does_a_mountain_lion_adapt_to_its_environment.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/line_6_spider_jam_specs.pdfIn PDF document text
    • http://smartcreditcheck.info/62228868463ha4ex.pdfIn PDF document text
    • http://fruit-italy.space/53646010873pmvsx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490272/normal_5fc8bf31ea52f.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/dudigonifu/51489301327.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/lenanogejena.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/14872073560.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/ewi_5000_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/bridger_ski_foundation_grooming_report.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/tulajolinojonusi.pdfIn PDF document text
    • http://wififeju.atwebpages.com/3209157555.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_off0000de3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 4880 bytes
SHA-256: 5cbc1d46dae23ffcdea4ca8a957de854d0c7febc5c1e6cffca37fdb35c852f4e
font_01_sfnt_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 10408 bytes
SHA-256: feed1f3a9854641ebd8e96a1016e5b13a018f1d85052e258ddb33ed728facff3

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