Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cc29f993fd3154…

MALICIOUS

PDF

62.7 KB Created: 2020-12-16 15:34:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f832fcd3260665493ff37231c18ac3c1 SHA-1: 786a8219dce5f7a10a7f848c070250d512e26a96 SHA-256: c9cc29f993fd3154b7a5a99e2dc1d80e52f291cd70d84fc3942b1313f08b9454
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/aws?utm_term=abaxis+piccolo+user+manual
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/mezaguwok.pdf
    • https://cdn-cms.f-static.net/uploads/4448341/normal_5fa52f24e8c3e.pdf
    • https://cdn-cms.f-static.net/uploads/4449987/normal_5fa6e6803d523.pdf
    • https://raralulewuk.weebly.com/uploads/1/3/4/4/134478892/tozigapuxibomev.pdf
    • https://cdn-cms.f-static.net/uploads/4462688/normal_5fa6f9806aeda.pdf
    • https://pujatimosu.weebly.com/uploads/1/3/2/6/132681823/lepojezapijogedagu.pdf
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/kokufowavaduxaminir.pdf
    • https://cdn-cms.f-static.net/uploads/4370055/normal_5f968944bf779.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sonutopexaramuf/lovovuneduka.pdf
    • https://uploads.strikinglycdn.com/files/0b3352d1-74ab-4fb6-84b4-3d27c908b351/50423807316.pdf
    • https://s3.amazonaws.com/wunojipu/vitamix_dry_container_sale.pdf
    • https://s3.amazonaws.com/jagux/22482531100.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_off0000b946.bin
a28fc6dd7bb9758b746b802ee2b9dfe12a400794aea1cd1a4ac6440c34532fa4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB946 5276 bytes
font_01_sfnt_off0000cb20.bin
6f82ead5cf296353d800d06f8ee3470831dc4a658c6dcc931d972c8f8197a5f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB20 10352 bytes