Malicious PDF — malware analysis report

Static analysis result for SHA-256 3217e253431102f8…

MALICIOUS

PDF

179.9 KB Created: 2020-12-21 04:26:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ccd598328483b4bb86cfdaa0fbeb058 SHA-1: 180225e32078fc98e2af8e5f44f27533aede78ea SHA-256: 3217e253431102f8937cdac62096899ae333cc234133c3df5c03ca2d16a5cbac
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffset.ru/123?utm_term=volvo+penta+sx+service+manual+pdf
    • https://zitifulopesere.weebly.com/uploads/1/3/4/7/134722705/431cbe60d4.pdf
    • https://nefirekemoziwep.weebly.com/uploads/1/3/4/3/134332842/muvibinugib.pdf
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/491a8.pdf
    • https://zilexewutefak.weebly.com/uploads/1/3/4/6/134608169/jimifosobaxulazuk.pdf
    • https://sazunanul.weebly.com/uploads/1/3/4/4/134488017/pomibafidoxere.pdf
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/witafiw_pokem.pdf
    • https://cdn-cms.f-static.net/uploads/4373755/normal_5fb7c1f0d44e9.pdf
    • https://cdn-cms.f-static.net/uploads/4498345/normal_5fd2f8ecbfd87.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc1050bab79f442f22a407f/t/5fcfad4aba7003536eb5e78a/1607445837212/52963761831.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf60ab1972c46e3c967264/1606377643575/wekilikizujatoxid.pdf
    • https://uploads.strikinglycdn.com/files/3814cc05-6d64-4f96-ba67-9f45ac4f632b/89563257786.pdf
    • https://uploads.strikinglycdn.com/files/26cc107e-97a0-4b3f-9909-d1a1184b96eb/kolawinezabe.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_off00027e72.bin
56a42f45516c77cf46f80ee95c0b4dd0d60420f8929f1ef843f266210cdab6e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x27E72 5392 bytes
font_01_sfnt_off000290bd.bin
f718bdc21cd3efb23fd26f08210f7861db14fa3ea380c74bd58ac820f5c300d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x290BD 15228 bytes