Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c97786e86566f9e…

MALICIOUS

PDF

70.3 KB Created: 2020-12-21 19:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e858a055f8f86b5bae472347126d497e SHA-1: 74d3328d646d89ed28c560729d19f2e3ed5385da SHA-256: 0c97786e86566f9e03216ddff9100ac90a0850b42dfaaa13bf81719430006e4b
186 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to various external websites, including one with a UTM term suggesting a search engine optimization lure. The presence of numerous external links and the ML classifier's high confidence score indicate a malicious intent, likely to drive traffic to potentially malicious or ad-filled pages. No scripts were extracted, but the PDF structure itself is used to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/aws?utm_term=manual+bar+cutter+supplier+in+philippines
    • https://pafuwaron.weebly.com/uploads/1/3/4/3/134385690/3d87a69.pdf
    • https://nozonefabizeg.weebly.com/uploads/1/3/0/9/130969368/8dec178afcc.pdf
    • https://dulipitigisol.weebly.com/uploads/1/3/4/7/134717891/jegofetolo_wobaritorufotil_sabimabakikiduf_tezasivaduv.pdf
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/1863925.pdf
    • https://pewaruraxifazof.weebly.com/uploads/1/3/4/3/134340131/kapenazi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4b5b02eb-1573-4527-ac94-f53a00bd9ea1/tesivazoworoziteja.pdf
    • https://uploads.strikinglycdn.com/files/c70bc0ce-6662-4dcf-a99c-115a86b0ae32/86086230548.pdf
    • https://static1.squarespace.com/static/5fc716d25c272238a818309e/t/5fcd48a15d2e6f3bda4b1139/1607288993860/mopumus.pdf
    • https://s3.amazonaws.com/werowibovezoje/auto_submit_form.pdf
    • https://s3.amazonaws.com/zaxawetawupo/durabejalo.pdf
    • https://s3.amazonaws.com/vudivuzakal/trados_groupshare_2017_installation_guide.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b332.bin
1a6dfd763f01c1251eb9160f678c486167bea1ac13c36d4733a48f8f3db0699b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB332 5168 bytes
font_01_sfnt_off0000c4ba.bin
59b1b72838e0056e6fd8376518a6e9853aefdfb383372c005dee504d76d75186		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BA 2652 bytes
font_02_sfnt_off0000d022.bin
95009124a640ecbaa15cd46be8fec1c8d1b77013abdf6b85798dc88312d28d6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 10060 bytes
font_03_sfnt_off0000f2a2.bin
2b0a2192378e6ab26ea1a2853cca26bf62e24bd1730e576d5fee4444468c8005		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 16880 bytes

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