Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcd5f6f30abbfa8…

MALICIOUS

PDF

66.8 KB Created: 2020-12-21 01:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71201daee6a24b689b4e4e1231a37ad6 SHA-1: 14b6972033b7760e004a88528fc184703080a416 SHA-256: ffcd5f6f30abbfa81f629f623ce9971cfc2f49ca115e39a7d2eaf0212e1e895e
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, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous external URLs, with at least one pointing to a suspicious domain ('traffnew.ru'). The presence of many links suggests an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the PDF structure itself is used to host these links.

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://traffnew.ru/strik?utm_term=general+grievous+costume+amazon
    • https://wulukapuw.weebly.com/uploads/1/3/0/7/130740123/5492006.pdf
    • https://vobemebu.weebly.com/uploads/1/3/4/3/134383317/46c7890e7f4356.pdf
    • https://static.s123-cdn-static.com/uploads/4407991/normal_5fc93782e05aa.pdf
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/tajalolumadava.pdf
    • https://mikodetakono.weebly.com/uploads/1/3/4/4/134497144/walez.pdf
    • https://static.s123-cdn-static.com/uploads/4371265/normal_5fca85d928701.pdf
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/9078787.pdf
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f8fe968b722d.pdf
    • https://cdn-cms.f-static.net/uploads/4448343/normal_5fba498f41e04.pdf
    • https://cdn-cms.f-static.net/uploads/4495393/normal_5fb88daa86614.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc729495f0d731e16aabfad/t/5fd67ace89566e781f52ddfc/1607891668193/58264134081.pdf
    • https://uploads.strikinglycdn.com/files/0b14f63c-c60f-4203-9165-63ca13368148/zte_z982_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/11571771-4e56-453b-849f-ae528763ad3f/36850852381.pdf
    • https://uploads.strikinglycdn.com/files/8c5a6dac-7630-459b-af2e-c520f4182a3d/75982590300.pdf
    • https://static1.squarespace.com/static/5fc64468403f5353fdba117f/t/5fd6849596ed101a3e4615c3/1607894166970/xuleruwuxepolelelok.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_off0000c5dd.bin
aec2dcf06e353f86c15d8511bfc4692bc035d910d6e1560ab3ddd8f31db7198f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DD 5260 bytes
font_01_sfnt_off0000d7be.bin
397391b728ecb7df1d1b7191beaa250efdcad928a20797d194aec5eb46d4f0ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 11292 bytes