Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a8313a3ddc75df…

MALICIOUS

PDF

99.6 KB Created: 2020-11-25 08:54:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25f0afdc97a6d7a6ae9722239afb3065 SHA-1: 27c39e80d27ad2b4f977b0ba16440e74ba5b45a3 SHA-256: e1a8313a3ddc75df55b8af7b0b5a88ddc37a9d116a99530d87341ee4f5372494
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic. The primary URL, https://trafficel.ru/strik?utm_term=beretta+92fs+inox+dimensions, suggests a phishing or spamming attempt. While no scripts were explicitly extracted, the presence of external links and the ClamAV detection as Pdf.Phishing.Trojan indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/strik?utm_term=beretta+92fs+inox+dimensions
    • https://cdn-cms.f-static.net/uploads/4452834/normal_5fb604fce410e.pdf
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5f89ac3d0e5e4.pdf
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5fa971b9e406d.pdf
    • https://toguxobuse.weebly.com/uploads/1/3/4/9/134902292/jokon.pdf
    • https://rilodogalaru.weebly.com/uploads/1/3/4/3/134398508/rufebobiximumoxodowu.pdf
    • https://suxokigivulumu.weebly.com/uploads/1/3/4/4/134479742/3540320.pdf
    • https://xusuzipurojovup.weebly.com/uploads/1/3/4/3/134325257/zuzorinowupo-kudifevub.pdf
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/2734f5d9.pdf
    • https://cdn-cms.f-static.net/uploads/4445333/normal_5fa73167eb2fc.pdf
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5fafaa19da9a9.pdf
    • https://tilafiranude.weebly.com/uploads/1/3/4/3/134314128/8c8db.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://uploads.strikinglycdn.com/files/bbd503c4-2baa-40ba-81fa-460a7aaa5db2/boxegex.pdf
    • https://uploads.strikinglycdn.com/files/f090d34e-6fc0-4111-95b0-32e26ef53929/58775573036.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://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a41.bin
e967df7d77952fea7ea7cef915939d796d23cd4992d6e7b1512a191f25e0b868
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A41 5424 bytes
font_01_sfnt_off00013c9f.bin
a7107279c4787920a8b2d150e81d7e8b50a88561dec240487cfe6ded26fbc0ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9F 8248 bytes
font_02_sfnt_off00015315.bin
288a13545c8e09df027e4b9c5dd4416cdeab8ab4827d54cbfa9ea8ff31c5ac4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x15315 14828 bytes