Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a94194d7ecd6d3…

MALICIOUS

PDF

91.6 KB Created: 2021-02-11 23:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6a2ecc3a43304fa5928b5de7b709c1b6 SHA-1: 2baa33c2e53819eb10d1c92fff433bfeb1a56691 SHA-256: 14a94194d7ecd6d3225c312b97f18dc84cca352207d774da88ef4ac5f89c3fe7
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 numeric slugs pointing to PDF files, indicative of a link farm. One of the primary URLs, 'https://druttle.ru/123?utm_term=hurricane+diagram+worksheet', is associated with this behavior. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to potentially malicious content or phishing sites.

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://druttle.ru/123?utm_term=hurricane+diagram+worksheet PDF link annotation
    • https://jonabosaguvaxak.weebly.com/uploads/1/3/4/8/134858844/3a79cb4c32cb6.pdfIn PDF document text
    • https://cdn.sqhk.co/palazawu/djbVjdE/prince_charming_dress_up_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/JcgjJYs/zombie_strike_fps_battle_assault_mode.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/6hixAid/hmrc_self_assessment_interest_calculator.pdfIn PDF document text
    • https://kitabenulo.weebly.com/uploads/1/3/0/9/130969432/siwuxelokujig_biluwoberese.pdfIn PDF document text
    • https://soruxepamoni.weebly.com/uploads/1/3/5/9/135992355/bd00d1b78.pdfIn PDF document text
    • https://dotomogef.weebly.com/uploads/1/3/4/7/134760479/7501748.pdfIn PDF document text
    • https://zusabave.weebly.com/uploads/1/3/1/4/131406295/9ecd2c3647f1649.pdfIn PDF document text
    • https://vofitikasu.weebly.com/uploads/1/3/1/8/131871658/lozawenika_difipowotuga_sadosox.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/kigavanus/22436629449.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/family_addiction_recovery_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/btech_cs_full_form.pdfIn PDF document text
    • http://gowatane.rf.gd/8173406568.pdfIn PDF document text
    • http://puxejinasor.epizy.com/muvutosaluxajoro.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/zofezisita.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_off00012b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5A 5440 bytes
SHA-256: b0a9e2f87975f0e45e39f0f41568901bf2a08342bf9eff282e08ebeed97f26a0
font_01_sfnt_off00013dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC0 10384 bytes
SHA-256: c2f04f9a35868e8cc9ba5b13329adc626e27b2f04da74d03e3cfc0fa31f442d1

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