Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ed505cf63e0e79…

MALICIOUS

PDF

86.9 KB Created: 2021-01-11 12:16:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 92bde33d54df1f8ec6c481fde3baee63 SHA-1: 4648b6e889c2df432b49597a5cd9915e26a44cb3 SHA-256: 81ed505cf63e0e79b81dfee24642be2eb7a9541b797dd9958b8f0d7e3d1f50e7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://traffnew.ru/aws?utm_term=fmla+guidelines+for+doctors PDF link annotation
    • https://jopomewimedadi.weebly.com/uploads/1/3/4/4/134465277/batulelixowumamo.pdfIn PDF document text
    • https://site-1174832.mozfiles.com/files/1174832/vegaser.pdfIn PDF document text
    • https://site-1172565.mozfiles.com/files/1172565/galaxy_shoot_alien_attack_space_shooter_game.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/ZhjEpzS/winkbed_luxury_firm_vs_soft.pdfIn PDF document text
    • https://wezunemoxojo.weebly.com/uploads/1/3/5/3/135321606/999281.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/Ehdiihj/polygrams_tangram_puzzle_games.pdfIn PDF document text
    • https://site-1176701.mozfiles.com/files/1176701/fafagitofixigagefarotifug.pdfIn PDF document text
    • https://xiwapidijiz.weebly.com/uploads/1/3/4/5/134511693/5319869.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/74e88eb3ff4c.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/ef37de4.pdfIn PDF document text
    • https://site-1176591.mozfiles.com/files/1176591/16623272302.pdfIn PDF document text
    • https://site-1084052.mozfiles.com/files/1084052/jodor.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/viromibukoleliw/fire_detector_installation.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/99959171039.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_off000116c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C9 5296 bytes
SHA-256: b22bea4149e4fad780e0ee7b8eefde7d096877b22a3a568f0f6671ebb3b196bc
font_01_sfnt_off000128ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BA 11112 bytes
SHA-256: 4ab44259ad0fb3a2e1af2e88469c8f64a588684160cd29699aa2392a3208c117

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