Malicious PDF — malware analysis report

Static analysis result for SHA-256 b938187468a0486a…

MALICIOUS

PDF

78.5 KB Created: 2021-02-15 17:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 46499aed8fe3a44024876774c66a362a SHA-1: d9ea5e1b4aa2957bce81c533c86e0a7bbceff0cc SHA-256: b938187468a0486a99085514148ac67e5ff0d573a6df2a29d55ce123b7d839d4
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to 'op art' origins, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://seumenha.ru/123?utm_term=where+did+op+art+originated PDF link annotation
    • https://birifukuko.weebly.com/uploads/1/3/1/4/131453348/kokabepax.pdfIn PDF document text
    • http://1cats.space/pamilabemoruv48po4.pdfIn PDF document text
    • https://ditiboxoteripu.weebly.com/uploads/1/3/4/7/134763901/nusujiwemogefix_gajiganu_xewudot_zixigorijokene.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_601f61ea61ce4.pdfIn PDF document text
    • https://mekebibarefuj.weebly.com/uploads/1/3/5/3/135335096/2da1d22c2e.pdfIn PDF document text
    • https://cdn.sqhk.co/wusezofetib/Th4TigR/ropekoxedexulalodizasun.pdfIn PDF document text
    • http://sallles.ru/mobile_speed_booster_appnfggq.pdfIn PDF document text
    • http://cozyplacefor.rest/the_hunt_wild_duck_hunting_season_new_jersey5cvba.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/moduluzuxikari/61566779188.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/xutanomit.pdfIn PDF document text
    • http://punugituk.epizy.com/98788963687.pdfIn PDF document text
    • http://lobivovakebala.epizy.com/vogamepidewirafunemenaro.pdfIn PDF document text
    • http://lazubag.epizy.com/eu4_mamluks_guide_1._28.pdfIn PDF document text
    • http://lejaget.epizy.com/vanilla_wow_mage_aoe_farming_guide.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_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 5024 bytes
SHA-256: 7f577d16ac67ce63487be7e1085b660c20b96ad44ed2ff532bfabbc51539b91b
font_01_sfnt_off00010a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A98 10248 bytes
SHA-256: 72e5acf72674a63f8e2b5ea2bae45734fd0d13052311e8a10ea5df1c2fc461ce

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