Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcef20ef2c52c6a…

MALICIOUS

PDF

87.9 KB Created: 2020-11-20 15:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e8f3963deb7123c2e69b247299fce34 SHA-1: 76373c08c42d51f36216504484128d87101715e1 SHA-256: 5bcef20ef2c52c6a9c3f579f8d8a78b8aaf1787f4198087eda0698363978fe7c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external links, many pointing to disposable hosting services, suggesting an attempt to manipulate search engine results or distribute potentially harmful content. The primary URL, trafftec.ru, is also associated with this activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://trafftec.ru/123?utm_term=the+pythagorean+theorem+and+its+converse+answer+key+with+work
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/8098586.pdf
    • https://sodujamewo.weebly.com/uploads/1/3/4/7/134750465/2632121.pdf
    • https://gorijifezavu.weebly.com/uploads/1/3/4/5/134502749/jiseto-wulowor.pdf
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5fac3ef47eda2.pdf
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/02fce90.pdf
    • https://safikevobajegev.weebly.com/uploads/1/3/4/3/134352312/penoj_gowexenedo_wumapavaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7609bd6e-3995-4a8b-bf6f-b8b8819b96b7/jetezu.pdf
    • https://uploads.strikinglycdn.com/files/3d8434ac-9ddf-4aa3-8d27-c19a20387cb7/33216275547.pdf
    • https://uploads.strikinglycdn.com/files/b1215518-7b2b-4a88-bddc-a8614b0fb428/72849272022.pdf
    • https://s3.amazonaws.com/jivuxo/hacking_books_in_urdu_free_download.pdf
    • https://s3.amazonaws.com/kavitokolezub/i_love_unir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fcc.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCC 2828 bytes
font_01_sfnt_off000119c7.bin
01af7f54adfbcdd783fef590a091ad0d84998725abce1e8ef53bb6f8b455f39a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119C7 5720 bytes
font_02_sfnt_off00012d31.bin
b20278e5ea75bbc2a5812480fdd71723620ead1cc49f9374ef60df0b2dd094c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D31 10036 bytes

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