Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c58e4122af3808…

MALICIOUS

PDF

80.2 KB Created: 2021-03-01 21:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 858f102bf9d4947675f1d8a93ef986df SHA-1: 15b0893bef210ac5e44b872558983b5861bdfa63 SHA-256: a2c58e4122af3808a25778ccf548f896f09639d61445a8577d0a2a2dec2f8a8d
164 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to benign S3 buckets, but also includes a suspicious URL (xezojetit.ru) and a ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection mechanism. The presence of a download button lure further supports a phishing or malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/123?utm_term=wall+street+journal+page+6
    • http://chelamela.org/92153405255oacdh.pdf
    • https://nufapapezo.weebly.com/uploads/1/3/0/9/130969462/4520316.pdf
    • https://cdn-cms.f-static.net/uploads/4402519/normal_602117116b1d1.pdf
    • https://cdn-cms.f-static.net/uploads/4379961/normal_602e2ac4b92c0.pdf
    • https://firikanafumofud.weebly.com/uploads/1/3/0/9/130969048/lajulegepa.pdf
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/9135532.pdf
    • http://ukranews.site/ribumagasikunokafunuvjq616.pdf
    • https://static.s123-cdn-static.com/uploads/4418000/normal_5fdfc251b8945.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zodawanuror/edit_text_size.pdf
    • https://s3.amazonaws.com/kubafezin/6679368369.pdf
    • https://s3.amazonaws.com/somisilegex/fozulelaleg.pdf
    • https://s3.amazonaws.com/jafujasiwetid/used_miller_trailblazer_302_diesel_for_sale.pdf
    • https://s3.amazonaws.com/desenaz/59373618276.pdf
    • https://s3.amazonaws.com/suzujewa/89265415858.pdf
    • https://s3.amazonaws.com/degisapemifa/96776485658.pdf
    • https://s3.amazonaws.com/retobifulipo/lumafelorefodogesotujufa.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_off0000fb6e.bin
6b0661bb66713f97420677f9730a348161de63a3b89d722870416df3b7b125bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 5232 bytes
font_01_sfnt_off00010d5e.bin
9a08c421f58841dcad57a8a4db369f97e1ac234593690927a07420fff97e4306
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5E 11228 bytes