Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b457e39cef614d…

MALICIOUS

PDF

71.8 KB Created: 2021-03-28 17:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: f7d114d8205a30dee341142976cba1f0 SHA-1: aef16bfc95075be2f86ae966047d4ad293064712 SHA-256: 64b457e39cef614d49098b43a8e3c6f20bbff8ee61f342cbdc7d8a499d7925d2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. ClamAV and ML heuristics confirm this is a malicious PDF, likely used for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://leonvi.ru/award?keyword=email+writing+format+samples+pdf PDF link annotation
    • http://filfex.ru/23953369554ttb55.pdfIn PDF document text
    • https://cdn.sqhk.co/siloneza/eKibjgB/liverpool_fc_fantasy_manager_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/hhkNXAo/45934026054.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/Hrxm1ha/hello_neighbor_act_1_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/futogifoku/igfijjf/asphalt_street_storm_racing_pc_cheats.pdfIn PDF document text
    • https://fobanuvoba.weebly.com/uploads/1/3/1/6/131637247/5514695.pdfIn PDF document text
    • https://fujulisu.weebly.com/uploads/1/3/4/0/134042697/zuzapolirolesanoj.pdfIn PDF document text
    • https://gekitudofu.weebly.com/uploads/1/3/4/4/134403565/fea0a.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/tjf4jjE/zombie_hunt_online_game.pdfIn PDF document text
    • https://generixa.weebly.com/uploads/1/3/5/3/135350481/zokikagof.pdfIn PDF document text
    • http://dogorove.22web.org/fonunijuxafaz.pdfIn PDF document text
    • http://trastqort.online/562471537466rsl0.pdfIn PDF document text
    • https://boziwukajolefix.weebly.com/uploads/1/3/2/7/132711983/jazelegisad.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/bokexizometun/sijugomuxapasizemo.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/kriya_yoga_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/nusuxelitafagi.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_off0000dd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD37 5412 bytes
SHA-256: cc22b5ff9a7455b524430b282e07bd0203603ccffdc6b59a18f8a54110274314
font_01_sfnt_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 10272 bytes
SHA-256: 548d3250a046900852699ccd785fed5b90dbd6c346874046d96983b625c917dd

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