Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c36e55bda67594b…

MALICIOUS

PDF

73.5 KB Created: 2021-02-16 10:45:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a9dac1154db8b6f9651217d82b7f55db SHA-1: c35ea514287fe783eb07b962a33442f7549bc98c SHA-256: 5c36e55bda67594b8865a7d07eb249cb1695ee17e2136f0877590351c923e633
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The presence of multiple external URIs and the link farm heuristic suggest a phishing or malware distribution attempt, likely delivered via spearphishing attachment.

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://druttle.ru/123?utm_term=toilet+training+in+3+days+book PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460980/normal_5fcd151129d2a.pdfIn PDF document text
    • http://itwomen.space/namapaxepapajibizadilujapn0l25.pdfIn PDF document text
    • http://xagowawusik.66ghz.com/all_perfect_tenses_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_601889a7eb3d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445130/normal_6027906e18f4f.pdfIn PDF document text
    • https://cdn.sqhk.co/bofilewidil/68igzib/caption_side_property_in_css.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/3qLGvgd/blackbird_fly_camera_decade.pdfIn PDF document text
    • http://biggymstoe.com/acting_lessons_apkzcdm3.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/Chdnjdd/konegopagefeteruditogapo.pdfIn PDF document text
    • http://serdyukov.pro/rowagirajesuv3heo.pdfIn PDF document text
    • http://tumbaa.space/lewadobeskpas9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494147/normal_600bbf5383865.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/ctIggjh/good_pizza_great_pizza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505837/normal_5fe4ee98f1a8b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wokoziguroron.rf.gd/12916860398.pdfIn PDF document text
    • http://josuguremim.epizy.com/ieee_seminar_report_format_ppt.pdfIn PDF document text
    • http://xaboduvipil.epizy.com/malnutrition_diagnosis_guidelines.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_off0000e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 5412 bytes
SHA-256: bae22402540b743d122d7ba46f36ef5caee43ed9427f0386416cce0c27b594cc
font_01_sfnt_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 10712 bytes
SHA-256: 35ef94a4d640de209a2c4d05eed56019a47a8fbc118c71bf72d49453999ff916

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