Malicious PDF — malware analysis report

Static analysis result for SHA-256 1571181c1d62e260…

MALICIOUS

PDF

93.0 KB Created: 2020-11-23 05:37:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f77d69e3798930b20fd6f5ea219daf1a SHA-1: ecd96010a60bd3549e01d854109b379a68235178 SHA-256: 1571181c1d62e2608ae358a7a7778ebc44bc383d798f3cb9fa6120daeb4edfda
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or trojan distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the PDF structure strongly suggest an attempt to exploit users through deceptive content, likely leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/aws?utm_term=los+alimentos+transgenicos+pdf
    • https://liwifaxuje.weebly.com/uploads/1/3/0/8/130874244/68fc228bb.pdf
    • https://winuvuvivadasuj.weebly.com/uploads/1/3/4/4/134480566/b5064ac9.pdf
    • https://vubosetupis.weebly.com/uploads/1/3/4/5/134594606/3279636.pdf
    • https://fiwazapabuw.weebly.com/uploads/1/3/4/3/134357015/1393611.pdf
    • https://rijumiwotoresu.weebly.com/uploads/1/3/4/4/134490354/5669409.pdf
    • https://zukifetev.weebly.com/uploads/1/3/4/7/134725253/tedox.pdf
    • https://kikeletiwemuk.weebly.com/uploads/1/3/4/6/134671512/7afd0a9c05.pdf
    • https://rewazifepa.weebly.com/uploads/1/3/4/6/134664269/zobupananuzop_wuwel.pdf
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/rowitadari.pdf
    • https://sajosapisede.weebly.com/uploads/1/3/4/3/134344890/nupojoxemamojogimop.pdf
    • https://wevupifusa.weebly.com/uploads/1/3/4/3/134356286/849142.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bubeto/50075653215.pdf
    • https://s3.amazonaws.com/mibiwivanetuj/onan_engine_service_manual.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_off000129dd.bin
1bea3124ed19e6fd27f3e3d08dc60df765d4ab0ab3c4641269f6ec3b2222cf87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129DD 5416 bytes
font_01_sfnt_off00013c38.bin
c7f986639fca8b7a3bcaebadd68563907fbea580c9917adefd8368f13858dc94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C38 13084 bytes

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