Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a285648b5a7182…

MALICIOUS

PDF

68.9 KB Created: 2020-11-24 02:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 345a2655abcd4e1dee5f62ec685c849e SHA-1: c64e59da4ff3213fcf0ed2e371d10886d25e1faa SHA-256: 96a285648b5a7182b8880b00192808b7c567d00b1d3ddf8a9e0cdd3d3c858867
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is part of an SEO link farm and uses a redirector to lure users with a "VPN free trial" offer. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafffe.ru/aws?utm_term=vpn+free+trial PDF link annotation
    • https://wegotutitupal.weebly.com/uploads/1/3/1/4/131453182/65967.pdfIn PDF document text
    • https://bupifepubeweta.weebly.com/uploads/1/3/4/3/134336259/pexevabanerariz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_5fb9c35e08e81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f87171ca7dd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_5fbb84a44c98a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413122/normal_5fb83cee7d52c.pdfIn PDF document text
    • https://repafajekojila.weebly.com/uploads/1/3/4/3/134305679/nobifagekesufavofu.pdfIn PDF document text
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/abbcf01823f57f7.pdfIn PDF document text
    • https://finivoxub.weebly.com/uploads/1/3/4/3/134387593/3bb842e38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e4f1171-4777-47a2-97bb-96268bb65cc9/which_alkaline_earth_metal_is_most_m.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78aa368b-477b-43ac-83bf-959496182d54/92203119269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e14bf1-a5c2-486b-9c57-6d63d4e1dda2/um_link_de_whatsapp_a_grupos_cp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7fe3fd-7c4a-478a-a7bd-a3db5ff94fb7/fupariki.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD316 4680 bytes
SHA-256: c28126cc931b7d6329f3ae48d8c2194549babaecf09cac9cb1b1607ed39f61ac
font_01_sfnt_off0000e318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE318 10548 bytes
SHA-256: df490664fa580139c113cac5a005257c05125852c51d15b41abffb6409e10618