Malicious PDF — malware analysis report

Static analysis result for SHA-256 3337cc305c0b4d4e…

MALICIOUS

PDF

80.2 KB Created: 2021-03-07 11:39:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 947e2637d6f7ff8396da106d619c1ecf SHA-1: ebe7c9c0bdf85b3c692d5547408701a32ebcd640 SHA-256: 3337cc305c0b4d4e352f84e5a07d163d798a64df57857a9880dc9d4e12061b03
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, directing users to an external URL. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded URL `https://resalured.ru/123?utm_term=what+did+the+second+estate+consist+of` is the primary indicator of this phishing attempt, likely serving as a lure to a credential harvesting page or a download site.

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://resalured.ru/123?utm_term=what+did+the+second+estate+consist+of
    • http://slimitalia.space/chaos_magic_band_wikipedia8en8f.pdf
    • http://iranianvc.com/mn_vikings_football_score_todayc2org.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_de88bccc4936430aa41d95ebeada71f5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d9713d46-2ec3-42cf-954d-09e83fa2d738/34000350883.pdf
    • https://uploads.strikinglycdn.com/files/65f4da51-606c-4390-b9cb-61b6fa1ba646/sandisk_clip_jam_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/735f02ab-2aaa-4116-9081-e54fdf3ba908/23215207695.pdf
    • https://s3.amazonaws.com/vifusupegiza/magazine_template_png.pdf
    • https://s3.amazonaws.com/lodazojamuva/399887940.pdf
    • https://s3.amazonaws.com/gedimuta/99319685170.pdf
    • https://s3.amazonaws.com/tikofaketonub/spider_solitaire_for_windows_10.pdf
    • https://s3.amazonaws.com/bomifabipi/dipper_s_guide_to_the_unexplained_all.pdf
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_91bf94e72d3740089a4a221e94a42f1e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/25f768e2-7c5e-45c4-a2bd-72d4faea73df/32783373215.pdf
    • https://s3.amazonaws.com/bokexizometun/sutagumazarevagawer.pdf
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_806c54efe4d84374ae6bc2928e56c5f0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f3e1558d-a989-41d5-9780-419ab8447d08/32375709409.pdf
    • https://s3.amazonaws.com/dojivewobasuval/wofititidexumedi.pdf
    • https://uploads.strikinglycdn.com/files/962f305c-a5f7-4ad4-b22b-65bf4108cc0b/gajij.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_off0000ff4c.bin
79e789b7e078d38beca317cbf784cd3d2c075d73454753b5418532c1f830e550		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 4996 bytes
font_01_sfnt_off0001105d.bin
acb8efaa3dcbc9cbd9cbd66b278fd3eaa03be7965a80904b08cbbb8152c63155		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 10476 bytes

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