Malicious PDF — malware analysis report

Static analysis result for SHA-256 281934d8ce4891a1…

MALICIOUS

PDF

64.7 KB Created: 2021-01-16 20:44:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5a8f0054496941278133fdaa13b063d7 SHA-1: ba383698a96c9d0a4fbb7e6b15163801ca5eac69 SHA-256: 281934d8ce4891a1a7ab3effe5647964fc56b3d23a5d6f0b8417f5ec02058f24
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to various domains, many hosted on disposable platforms like Weebly. The primary purpose appears to be directing users to potentially harmful content or facilitating SEO manipulation. No scripts were extracted, but the presence of many external links suggests a phishing or content-luring attack pattern.

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://trafficel.ru/wb?keyword=2014%20super%20snake%20mustang%20for%20sale PDF link annotation
    • https://fenorepaxok.weebly.com/uploads/1/3/1/8/131856491/towezofetafikun.pdfIn PDF document text
    • https://pinonomobeberex.weebly.com/uploads/1/3/4/3/134318871/7674468.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/parabetuxozopi.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/gjcv1ij/plants_vs_zombies_free_download_hacked_version.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/8429399.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374211/normal_5fce3084a3e07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408879/normal_5fe91b400109e.pdfIn PDF document text
    • https://fuvapele.weebly.com/uploads/1/3/0/7/130738919/jowimef.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/634817.pdfIn PDF document text
    • https://lubavezutumeji.weebly.com/uploads/1/3/4/7/134757539/vogumanozugopajadi.pdfIn PDF document text
    • https://boxuxavuviw.weebly.com/uploads/1/3/4/7/134716171/2814182.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA4 5604 bytes
SHA-256: d771ab76616471f9373bbb08435613b275a1099e2446c4ca661ef6f33ba542d2
font_01_sfnt_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 10452 bytes
SHA-256: f45112dc4224ada176825dd0b886465f9176029c1cff9ed1e430cd82e64739f1

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