Malicious PDF — malware analysis report

Static analysis result for SHA-256 850f94af3908833c…

MALICIOUS

PDF

118.4 KB Created: 2020-11-13 05:39:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6edd984fa5e189424e06fd73069a75bc SHA-1: d9f115c4ae57a9921330c936bebf12edf80c53cf SHA-256: 850f94af3908833c0884f5acf3aaf109beb729deed719be4dcf595930d35a7f9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links intended to manipulate search engine results or direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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=mta+subway+map+new+york+pdf
    • https://cdn-cms.f-static.net/uploads/4405208/normal_5fa537f232d13.pdf
    • https://mivijupa.weebly.com/uploads/1/3/4/5/134578330/saledazivaz.pdf
    • https://cdn-cms.f-static.net/uploads/4375522/normal_5fa64f1528c76.pdf
    • https://cdn-cms.f-static.net/uploads/4379385/normal_5f8b4b7b1bf97.pdf
    • https://cdn-cms.f-static.net/uploads/4381756/normal_5faaa9c8cef4c.pdf
    • https://sazojowob.weebly.com/uploads/1/3/4/3/134351878/2795779.pdf
    • https://jogojirodatu.weebly.com/uploads/1/3/4/3/134321770/webifijuwujaw-bovubisiwigo.pdf
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/210471.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/29bf012b-8954-4c26-8c9b-4ef76724dc7a/no_logo_naomi_klein.pdf
    • https://uploads.strikinglycdn.com/files/d4d4fdb1-a1db-4527-bf63-c2e4005a9c6b/89833377251.pdf
    • https://uploads.strikinglycdn.com/files/00f694ba-fa6c-4359-a336-de1493c28bb3/73765747549.pdf
    • https://uploads.strikinglycdn.com/files/92a90fb5-a0e6-44e2-a8a9-642f176a821e/max_dirt_bike_3.pdf
    • https://uploads.strikinglycdn.com/files/06626bf0-7ed2-4828-8cbf-729c627f4dfb/88117436552.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_off000190c4.bin
49deafed0e5fb0736bdaee2f69ec34adf6b9d712c45548d8b50820184f0f42e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x190C4 5556 bytes
font_01_sfnt_off0001a3b5.bin
6f7d2109b8851787d0e430ffeef8896290b3ad7aff2418f8a2dc1bd8d7954ab5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3B5 11884 bytes