Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f23885d5392a31…

MALICIOUS

PDF

75.3 KB Created: 2020-12-19 01:55:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1d8d3804b16a77d031fef7c044c8d4c0 SHA-1: 79ba980cd3c33a6660a93f44402594a8237e8f6a SHA-256: 93f23885d5392a312f507f31357077241877899cc5ed6bddbd123bd68973eba2
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'vintage chenille bedspreads', suggesting a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/123?utm_term=vintage+chenille+bedspreads+for+beginners+collectors In PDF document text
    • https://kigijogi.weebly.com/uploads/1/3/4/7/134702755/supitosam_nolepebinagod_vemaluwes_gufasilagusabap.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/ledodamabosibitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420449/normal_5fa01a341974e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_5fad2428050ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_5f90bab675e6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447450/normal_5fadbd50e86db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc18963085bf90c0e0195e8/t/5fc7879493ad1a48121ee05d/1606911895416/nomege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8ba0dfb-cf5d-4a1c-b909-7388cc190fb8/66642610889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4765b5a-de61-45c0-8129-710f11cb2e35/85376065091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75038406-98d4-4a44-afc7-569b53e4c442/witeginedetasas.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA2 5308 bytes
SHA-256: 5621aa310b927b682a65e9c150b150e5534235c9f07ddf037a38343c42a43e3e
font_01_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 11036 bytes
SHA-256: 13e62e11a626a856d252f711a59f511c19584308d89bc20508f371ba7a8666b7
font_02_sfnt_off00011205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11205 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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