Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b33b0ddf98a567…

MALICIOUS

PDF

63.6 KB Created: 2021-02-23 00:14:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 7ecebd6bf0c35232441ea384a92f11f1 SHA-1: 0898dcac06ed83edcd8564657da4334f20f1f2f4 SHA-256: 49b33b0ddf98a567d36a966812f86a919f9b0976136ae63f1febce6c67eb4dfc
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external URLs, including one pointing to 'seumenha.ru', suggesting an attempt to redirect users to potentially malicious sites. The PDF structure and embedded links indicate a likely phishing or malware distribution scheme, masquerading as a game strategy guide download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=red+dead+redemption+strategy+guide+pdf+download PDF link annotation
    • https://kavosimodo.weebly.com/uploads/1/3/4/9/134901779/1388797.pdfIn PDF document text
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/726085.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/ggiVspd/vunitawakigoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465396/normal_6030f7aab357a.pdfIn PDF document text
    • https://zudasejavezumuj.weebly.com/uploads/1/3/4/0/134017640/kowezofudaka_kafoj.pdfIn PDF document text
    • http://trend-sales.fun/62774754503kl4hm.pdfIn PDF document text
    • http://frankkyko.com/x-_wolf_testosterone_booster4ho0o.pdfIn PDF document text
    • https://selokifasafu.weebly.com/uploads/1/3/4/3/134383977/a97c4098.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/iimJG6q/world_of_kings_battle_mage_guide.pdfIn PDF document text
    • https://mokufanogokotim.weebly.com/uploads/1/3/1/4/131406807/kadoko-fibofojixug.pdfIn PDF document text
    • https://jejipabiximi.weebly.com/uploads/1/3/2/7/132741556/7203892.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/whwKhdr/ohio_police_killed_today.pdfIn PDF document text
    • https://mutuvedaluvop.weebly.com/uploads/1/3/1/8/131856278/bamigagekozi.pdfIn PDF document text
    • https://jijaxiwiruba.weebly.com/uploads/1/3/5/3/135333012/xored-bodebosatigefak-furidopiw.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/pizexopenaxu/jexowuzuwamimifazebaze.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/symbols_of_the_holy_spirit.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/62747789866.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_off0000bbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCF 5560 bytes
SHA-256: f7bad037699219746496e33497c0b42897de5a6f4590ac6e392a8f65c735b9f3
font_01_sfnt_off0000cec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC5 10080 bytes
SHA-256: 71a5178483b1585a5385c410523ceee718c22a674065c6d41e2cdf2da173b6c8

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