Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbd9ca395fb3733…

MALICIOUS

PDF

59.1 KB Created: 2020-12-22 05:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66e59519e65d4f1def76ce981ffa45ab SHA-1: 79ff731dc4ff8c4bbf38945c398c75ea7bb5900e SHA-256: 9bbd9ca395fb37333f3780b6ef9c8acfffd33f747acec6d49f28ed498473323c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malicious intent. It contains numerous external links, with one specifically pointing to a URL that appears to be part of a link farm designed to distribute malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/strik?utm_term=advantage+general+online+quote
    • https://vuguzunorofina.weebly.com/uploads/1/3/4/3/134322364/zudejonixetixa-mupajososasobik-fiwop-jitirapa.pdf
    • https://static.s123-cdn-static.com/uploads/4408594/normal_5fc5b3e26cc91.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xilasisefi/minix_neo_z83-4_linux.pdf
    • https://s3.amazonaws.com/satudifin/dogswell_happy_hips_recall_2018.pdf
    • https://uploads.strikinglycdn.com/files/eebae67e-6a1c-4e7b-b346-9c1a7f7343e2/gamuterewotad.pdf
    • https://s3.amazonaws.com/rojalexipokadaz/cosine_rule_to_find_side_worksheet.pdf
    • https://s3.amazonaws.com/wewiro/beyblade_games_for_pc_free.pdf
    • https://static1.squarespace.com/static/5fc2b942c6d96458362de91d/t/5fd0956bfc93c51d16e1bc69/1607505259768/zejasanusiseloga.pdf
    • https://uploads.strikinglycdn.com/files/fdca1dbe-b1b9-4f40-aa41-a6a209827249/jininokuwide.pdf
    • https://static1.squarespace.com/static/5fc52a646b97992eb5777856/t/5fd008f275371c172f22a10a/1607469299733/pizegufomiritotetakem.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_off0000ae0e.bin
e1bc0f4b6eaffe9d59ea8f2d98f847d7a0948a1c963dd96298545d07e5c996af
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0E 4988 bytes
font_01_sfnt_off0000bf12.bin
5e43863f8929ead2dd3becddf920d29bd9d3b0af2e5c67501ead3389f2b7ef8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF12 9800 bytes