Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3db1951abf79592…

MALICIOUS

PDF

63.6 KB Created: 2020-11-20 14:58:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72baed7f1637bf3137a171d0dfd1d1fe SHA-1: d4b674c29bcd51ab1935d670e97abe26f6f8a043 SHA-256: f3db1951abf795923113e8143e34c97071bf8e3ffd49768994000c58d55e1749
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 link farm, which is a common technique for SEO manipulation or directing users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to potentially harmful content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=gururlanma+insano%25C4%259Flu+ilahisi+dinle
    • https://kolajinetam.weebly.com/uploads/1/3/4/5/134584148/5953831.pdf
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/189f0cc6e3.pdf
    • https://gufubavofunopi.weebly.com/uploads/1/3/4/7/134704705/kekojujevagezudame.pdf
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/bugan_mekaj.pdf
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/6c66d7916.pdf
    • https://cdn-cms.f-static.net/uploads/4448743/normal_5fafe81ca4de0.pdf
    • https://powipawi.weebly.com/uploads/1/3/4/3/134313445/monef_vagifit_sikipevofax_gonujezazunemu.pdf
    • https://mixosikopas.weebly.com/uploads/1/3/4/3/134383158/5935434.pdf
    • https://fomikozifu.weebly.com/uploads/1/3/4/5/134511133/2948112.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/14963acd-f5b9-4d75-8bdc-0a31d68bd208/4226097184.pdf
    • https://uploads.strikinglycdn.com/files/89ad215a-620d-4965-8532-1960944dd478/fiscal_policy_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/531d5058-6c70-4db5-ae7e-b76b6b97bb77/fibegijule.pdf
    • https://uploads.strikinglycdn.com/files/f6082103-1b8e-46f8-917f-c46deb209ebf/42866324399.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_off0000b870.bin
b2b41d4e3e880b440296a25096930befc349eed9d06765c427db611c3372cde6
pdf-font-stream PDF embedded font (sfnt) at offset 0xB870 5328 bytes
font_01_sfnt_off0000ca5b.bin
76447cbdf59bdd9dca3b618ea97a7ab1a7778ff2e1477cf3f79e60b8c44cecf3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5B 12076 bytes