Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f512f92fed7f0a…

MALICIOUS

PDF

65.5 KB Created: 2020-12-03 20:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12334d632a906011476b989935a58585 SHA-1: 12d6aa9c8bc7d369e0ae3983ca90c5784ec7958a SHA-256: 35f512f92fed7f0ac1827a98fa9314276ab1c9d4fcb74b468c9df9f075868ba2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, with a critical heuristic identifying it as a PDF link farm. The primary malicious URLs identified are associated with phishing and potentially hosting further malware. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to malicious sites.

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/strik?utm_term=yards+per+pound+inc
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/bikotegegoxaxobeti.pdf
    • https://kizozejibudi.weebly.com/uploads/1/3/4/4/134460324/3774746.pdf
    • https://cdn-cms.f-static.net/uploads/4495040/normal_5fbea150e3d3e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/114fe455-83e3-4992-8c52-ca7449c10faf/zaserukolona.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0973bc819f1cf49fb69e/1606289781311/nos_tomamos_un_cafe_descargar_gratis.pdf
    • https://static1.squarespace.com/static/5fc59cfe2e537a05ef29188a/t/5fc67eb13570fb44d1e3e245/1606844084650/75190049187.pdf
    • https://static1.squarespace.com/static/5fc5181abe9b69395125e644/t/5fc788dc0623334b0c6344e0/1606912220709/pink_piano_crown_point.pdf
    • https://static1.squarespace.com/static/5fc0de27085bf90c0efce9ba/t/5fc30ace3485235c862b0d3f/1606617807685/mosifusozuvilopigexuvi.pdf
    • https://uploads.strikinglycdn.com/files/a88f0305-f71f-4540-a87e-beb698fbe519/minomemapuj.pdf
    • https://static1.squarespace.com/static/5fc30eb611f6a4198493c815/t/5fc53dd95147b14804dd65d4/1606761946041/antoinette_sedillo_lopez.pdf
    • https://static1.squarespace.com/static/5fc665731452f90b7f0a9eb6/t/5fc8494726a3037b433673fa/1606961480472/20639030614.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_off0000c470.bin
3a69bb659d38adf5f24910eb520d46a0f45743ce41a08fe19e64cec7169b5e49
pdf-font-stream PDF embedded font (sfnt) at offset 0xC470 4996 bytes
font_01_sfnt_off0000d580.bin
fc103d050c9ee4ee41460bc767894f35359bc117f1c615b3685111a324a4e6db
pdf-font-stream PDF embedded font (sfnt) at offset 0xD580 10656 bytes