Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3b144f91b73d6e…

MALICIOUS

PDF

69.3 KB Created: 2020-12-28 04:16:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f3e36846efe8c1bcb87143a14c729177 SHA-1: 5ca57a1e8963d17693b6540950d370712a4e3707 SHA-256: ab3b144f91b73d6ed18bf24ea013ed9cf6fd1141381ac43076e9e80dcea9e809
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to the malicious URL, suggesting a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/strik?utm_term=new+christian+song+about+peace In PDF document text
    • https://static.s123-cdn-static.com/uploads/4380210/normal_5fc6711ce5b53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_5fa72c56b5633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5fb2f696838e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_5fbc7646dd98e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_5f986607d2253.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1d46e8dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460063/normal_5fa3291926fcb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/753967c2-92f6-4e50-8ab1-09d370636732/dragon_quest_11_casino_connoisseur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac2d4873-72b4-4bb2-8078-0f5ff10a52be/rspca_free_first_aid_guide_qld.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b275f37e-5325-4a60-b831-01d6c7656c2b/i_spy_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/418e295c-c680-4729-8a45-48c118077fac/med_eitleri_rnekle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34a9d40-59b5-402f-99be-2d461bd466cd/16244972792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf9bbcf-fe04-4b3b-8ec2-fdf6b1d0fabb/nosaxasekuxurejex.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F3 5364 bytes
SHA-256: 5780172d9a02b0f024c8293e98e2caf551243ee33786f1003610f5c75c52eaf1
font_01_sfnt_off0000e443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE443 10916 bytes
SHA-256: 39134802e76e7acb194ee2738edbf922f852db0f396ed30480a7398e40febe03

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