Malicious PDF — malware analysis report

Static analysis result for SHA-256 543e45f45c6f34a5…

MALICIOUS

PDF

100.6 KB Created: 2020-12-06 01:39:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30919bc4445a225bb1229873e1de8252 SHA-1: 5398ba2025e3df85f5581d0888a732bbee90a907 SHA-256: 543e45f45c6f34a5183044754b46c606c8c76304995237b54616df13889792f5
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9740

Heuristics 5

  • 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
  • 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://trafffi.ru/aws?utm_term=fancybox+pdf+demo
    • https://static.s123-cdn-static.com/uploads/4415944/normal_5fcc17867dbbc.pdf
    • https://static.s123-cdn-static.com/uploads/4476445/normal_5fcbf34ebc7c7.pdf
    • https://nimifitirujaga.weebly.com/uploads/1/3/4/6/134693460/2033364.pdf
    • https://vadukoku.weebly.com/uploads/1/3/4/7/134707593/1a31bd2c05.pdf
    • https://diwopasod.weebly.com/uploads/1/3/4/4/134475510/94c6fb.pdf
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/d048891.pdf
    • https://wisezoverok.weebly.com/uploads/1/3/4/7/134707123/1028652.pdf
    • https://modudipagif.weebly.com/uploads/1/3/4/6/134688888/a0fb4697a2f47.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/subud/duzulumedazosutuweloli.pdf
    • https://s3.amazonaws.com/pivetuzadujo/xavaxiputuraxexefesufu.pdf
    • https://s3.amazonaws.com/zirojopemup/holy_bible_english_version.pdf
    • https://uploads.strikinglycdn.com/files/26706dd2-d00d-4e83-a900-40a361f130c7/nanozabugedapebula.pdf
    • https://uploads.strikinglycdn.com/files/c6471c8e-531a-4526-b73d-9f7ccb7bfcbd/dakezajezij.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001799f.bin
2279c90166d536f4154cfd0332c318809f584629b9d0a0c7ecd7af5aeb69646e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1799F 5260 bytes

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