Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb4dbae2f33fed0…

MALICIOUS

PDF

67.1 KB Created: 2020-12-20 21:47:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54586c8bc4123ba8e4df2fe9d4851eef SHA-1: d717ad111b77441f7afe4eb7137b2e350176bd03 SHA-256: beb4dbae2f33fed01ec2000df2ab2b96815aa344f3e86918d94bcfab68541dce
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to disposable hosting or redirector services, suggesting a link farm designed to obscure the final malicious destination. The primary malicious URL identified is https://gettraff.ru/strik?utm_term=80+bus+schedule+pdf, which is flagged as a known malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://gettraff.ru/strik?utm_term=80+bus+schedule+pdf
    • https://wotuvakarebor.weebly.com/uploads/1/3/4/6/134665633/ddd84b7.pdf
    • https://xiwujanif.weebly.com/uploads/1/3/4/7/134705994/78bb2b4fd87.pdf
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/xekena.pdf
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/selodiguriximox-vuxajobej-jiripajaxemipu-witimuvaxaxe.pdf
    • https://xavupavise.weebly.com/uploads/1/3/4/5/134584264/gazetogizirul-bikin-zesuvizawenor.pdf
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/24ec56882a095d.pdf
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/aca1342c21560c1.pdf
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/c6f4e7.pdf
    • https://jaxemojemilela.weebly.com/uploads/1/3/4/6/134622921/8180785.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc2b0d2239b0722913ccfbe/t/5fcc7224662d5e24e09a98ad/1607234084594/84215336211.pdf
    • https://s3.amazonaws.com/kopisigapub/more_more_amore_song.pdf
    • https://uploads.strikinglycdn.com/files/c7fce560-a026-460e-b5fb-d6f50de88002/36276416928.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc93.bin
06906b0a076058f4d098f3e5f097eecd8cf42f8403e3bfa0a705d8a01d28e4dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC93 5316 bytes
font_01_sfnt_off0000dea3.bin
7500987a49a7fb10221d4ae421f59338f462604c753ef241d986860b5f95deb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA3 9764 bytes

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