Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a9565a3ceeade7…

MALICIOUS

PDF

72.7 KB Created: 2020-11-18 19:12:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7e592faad590a805827e729e1b58efa SHA-1: b9c3a89e5f9fe62499d4a43d2ff24b6cfc49a21d SHA-256: 54a9565a3ceeade715536b5533ce5007173ed7c85969e9d9634bbd84b5589ef6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other cloud storage services, suggesting a link farm or distribution mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://traffine.ru/123?utm_term=greg+comer+has+battled+cancer+for+almost+7+yrs
    • https://tubomomumaxef.weebly.com/uploads/1/3/4/5/134508744/0448d72bdf418a7.pdf
    • https://cdn-cms.f-static.net/uploads/4450889/normal_5fa61d32e53f5.pdf
    • https://cdn-cms.f-static.net/uploads/4447263/normal_5fa8b9bce48f6.pdf
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5f8d63d37c681.pdf
    • https://cdn-cms.f-static.net/uploads/4449187/normal_5f9f5f8692f0a.pdf
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/runemevurexuziwone.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/leguvefu/kiran_biology_book_in_hindi.pdf
    • https://s3.amazonaws.com/daraniwekamidir/94369305378.pdf
    • https://s3.amazonaws.com/ganubatebedoxez/platos_dialogues.pdf
    • https://uploads.strikinglycdn.com/files/a010e294-7bb6-4736-8b24-b290542f3603/rofom.pdf
    • https://s3.amazonaws.com/putelekireza/29055124343.pdf
    • https://s3.amazonaws.com/subud/how_to_boot_from_usb_windows_10_msi.pdf
    • https://s3.amazonaws.com/juduk/alfred_kropp_the_seal_of_solomon.pdf
    • https://uploads.strikinglycdn.com/files/73f27895-d9ef-4eb1-aab1-8fa8ec172c68/31598511356.pdf
    • https://s3.amazonaws.com/zonivezada/matchbox_garage_playset_1969.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_off0000ddff.bin
8b1445fe20b7ec9d0107e22efabf04ab8d1f4e58624ccf47ac1d8b14e9c480d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 5788 bytes
font_01_sfnt_off0000f198.bin
e03b9b68b531c3d395668dba825a844cb533dd6f0b494f41d8cf64a5edcefcf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 10560 bytes