Malicious PDF — malware analysis report

Static analysis result for SHA-256 333c019bfc057bfd…

MALICIOUS

PDF

74.9 KB Created: 2021-02-14 08:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e03a6c9fb6b08913db356488d325290c SHA-1: 49efa5d0a34bd12508965070ac4833e35db3c2fd SHA-256: 333c019bfc057bfd246db590b8f76a73a9070b747c892999186f94b2e4882db9
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The document's structure and embedded links suggest a phishing attempt to redirect users to malicious sites for further exploitation. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=c+of+o+authorization+form+dc In PDF document text
    • https://static.s123-cdn-static.com/uploads/4446781/normal_5fee3a1781926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453326/normal_6021e861cfd33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484805/normal_5fdb71d5600d7.pdfIn PDF document text
    • http://3203epworthcres.com/331600476445gc6h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413226/normal_60286a21496c5.pdfIn PDF document text
    • http://9gusevshop.website/639479909811r0kb.pdfIn PDF document text
    • https://cdn.sqhk.co/xedasuzefer/VijgOWQ/hobbykids_adventures_the_game_hop_n_chop.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/dzjfijd/ziwufexejopef.pdfIn PDF document text
    • http://ita-yog.space/15071122174hn7o9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384835/normal_5fe8051b9a4bd.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/aox6ge0/69141228219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_6028017b88b37.pdfIn PDF document text
    • http://bifitiguz.iblogger.org/23584657376.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/ijbifSO/download_game_animal_camp_healing_resort_mod_apk.pdfIn PDF document text
    • http://vobemosezo.22web.org/2481081190.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bikutuvuxaxixo.epizy.com/wewinexurafizutalejopon.pdfIn PDF document text
    • http://dovagoxaluzof.rf.gd/heathlands_care_home_cqc_report.pdfIn PDF document text
    • http://bosefijov.epizy.com/wejugikonalokewimufamix.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD493 5004 bytes
SHA-256: b84c636174b549f841d430bec5f13f9d917c7e9d5e3d7a3ad360dcf576a57f29
font_01_sfnt_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 10452 bytes
SHA-256: 7b9f32382603c462ce7db99738a0e7064d69253138bde524e06a13d3894ede9e
font_02_sfnt_off00010974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10974 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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