Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a00f05cf72509e4…

MALICIOUS

PDF

70.2 KB Created: 2020-12-27 14:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93155e3ca9140e8d4069cc3bec0e1363 SHA-1: ef26e19803a13a7176db418b39658b0f8eb5dde8 SHA-256: 0a00f05cf72509e4770872ab8ed1c26a55780e92c1661b7a3db2a072bae3d7d4
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external links, with one prominent URL pointing to 'trafficel.ru'. The document body, though heavily obfuscated, suggests a lure related to 'A streetcar named desire crossword answers', indicating a potential phishing or content-redirect scheme. The presence of multiple external links and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/123?utm_term=a+streetcar+named+desire+crossword+answers
    • https://cdn.sqhk.co/momujolo/dAjdicU/70439069890.pdf
    • https://gesojotumone.weebly.com/uploads/1/3/4/6/134614539/3a43cd3104.pdf
    • https://biposekiz.weebly.com/uploads/1/3/5/3/135349949/fefofidanozesur.pdf
    • https://cdn.sqhk.co/kevejonob/yVqjg13/luvirokubuvarisu.pdf
    • https://mukokoloraji.weebly.com/uploads/1/3/4/1/134131612/6239526.pdf
    • https://static.s123-cdn-static.com/uploads/4448540/normal_5fde06bc2abc7.pdf
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/1544774.pdf
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/rexukaxusebo.pdf
    • https://javagakikidubat.weebly.com/uploads/1/3/0/9/130969576/rekinetixesu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7d65c3b6-c640-4068-b701-0325945c4670/gotedibavunodomo.pdf
    • https://uploads.strikinglycdn.com/files/c1a5a26c-b1ee-4417-8c73-2a52a0b4b816/5100762309.pdf
    • https://uploads.strikinglycdn.com/files/0655b142-6705-41d8-9754-6d5d1e1fc222/satugevizivuvopelilus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9ee.bin
fcdd1d7b702465a986dd6c06a8017f4dc4c7cbc59bfb62329c144fb750188843
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EE 4920 bytes
font_01_sfnt_off0000da8f.bin
1fb28cc0d32445c8c451c618d15704f487bb2eaa67f4a0aa054d20b66bedba23
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8F 10424 bytes
font_02_sfnt_off0000fdf0.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 4324 bytes