Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9544751f4d44fb1…

MALICIOUS

PDF

66.7 KB Created: 2020-11-23 18:47:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 60a0bfe9a76d886edb85ab5cb3e58a01 SHA-1: da549d321dd4b28b137c3dd39f21ed8de0e9d032 SHA-256: b9544751f4d44fb16a12539445bdfa90de95e6ad30220abf6b7470736f736028
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirect to malicious infrastructure. The heuristic firings indicate that this is a link farm designed to lead users to malicious sites, likely for phishing or malware distribution. ClamAV detection further supports its malicious nature.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=sindrome+de+desgaste+pdf In PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/newukaf.pdfIn PDF document text
    • https://weludabaner.weebly.com/uploads/1/3/4/8/134854782/6847156.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/40ddfa4d7f4e3e.pdfIn PDF document text
    • https://jakinamil.weebly.com/uploads/1/3/4/3/134391996/7756588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5f8a8c5646c80.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/bagetobaba_sabaxiripijuli_vimomikepizidoz_rifaro.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/zezozetagorijav.pdfIn PDF document text
    • https://tunuwowidu.weebly.com/uploads/1/3/4/6/134606858/xabafo.pdfIn PDF document text
    • https://zijixowopuza.weebly.com/uploads/1/3/4/5/134524639/9852548.pdfIn PDF document text
    • https://kefanizitadibuz.weebly.com/uploads/1/3/4/3/134328212/nifopalikeberop.pdfIn PDF document text
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/wisugikovif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369507/normal_5fab5843ddb2c.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/zedudo/hard_brain_teasers_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/how_to_write_a_written_statement_for_work.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/cedar_point_steel_vengeance_mean_streak.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_off0000c9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B1 5432 bytes
SHA-256: 67e2e4d2cd31039fa01c650df589ae828bfc0a1c273927131f1cc48d74411c03
font_01_sfnt_off0000dc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC13 10484 bytes
SHA-256: 77c12c334a67cbaf4421887ec175e97832fe994301f1a14d12b40608324818ca

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