Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a9ee8633b3f66e…

MALICIOUS

PDF

66.8 KB Created: 2020-11-23 14:07:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68c25d8820d49f46cd2d535f97992e9e SHA-1: bfc8d976bb20aa60a9e4c509a9a1c209d2d8a6d2 SHA-256: a3a9ee8633b3f66e4c29f2310b2c897f2dec9a28700b9a4e331030fbe3688c7f
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URLs, particularly 'https://gettraff.ru/123?utm_term=chicago+electric+generator+66619+manual', are indicative of phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://gettraff.ru/123?utm_term=chicago+electric+generator+66619+manual
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5f90b0b6436f7.pdf
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/5167020.pdf
    • https://cdn-cms.f-static.net/uploads/4374839/normal_5f9b6fe40431c.pdf
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5f8bee3c3eeb1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gezejoputiwinu/kentucky_natural_resource_jobs.pdf
    • https://uploads.strikinglycdn.com/files/f495769c-7509-4818-91ca-8f83ba5194b4/59320594951.pdf
    • https://uploads.strikinglycdn.com/files/94278c1d-bb81-45c5-8451-a68cf3dd79af/50483118310.pdf
    • https://uploads.strikinglycdn.com/files/4dabbaa5-14d9-452e-8ad7-04859bd005fb/sagifepov.pdf
    • https://uploads.strikinglycdn.com/files/85722d4d-0071-452c-9b03-87d64eae584b/fogivuwofixobuvugegag.pdf
    • https://uploads.strikinglycdn.com/files/12350901-6a8b-4410-9918-0ecbf4c2110c/88155136171.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_off0000c82f.bin
8444bee667515c29e5f1b6b05dc2d6069d1571f8d500236ca8eb89265e49a7b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC82F 5300 bytes
font_01_sfnt_off0000da0d.bin
006dc16a21fe8be43a2cf80e8e29f8f72204db2881f4b69c7477d11aa6c98e89
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0D 10760 bytes