Malicious PDF — malware analysis report

Static analysis result for SHA-256 424faac8cad690a8…

MALICIOUS

PDF

74.7 KB Created: 2021-01-16 15:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4c7339aefbc9dede2fb4a659bc1cb4ca SHA-1: e93a61ed265cb2d4761139bc0eaec94497ac1d0f SHA-256: 424faac8cad690a8f2a591d4a16ceb60527985af0ef3369ef11096090ffafcbe
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect the user to malicious content, likely leveraging a PDF vulnerability or social engineering.

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://traffine.ru/aws?utm_term=costco+fleece+sheets+double In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414867/normal_5fa2c51a9745b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464527/normal_5fb2d1344bdcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450257/normal_5fa7b4fec1c92.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/1447760.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416304/normal_5ff8c8a6233a7.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/ihaiajg/29883001793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443337/normal_5fd68516c05a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416132/normal_5ff57ac818bf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5fda7907eafbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_5f92787abdd39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383322/normal_5ff69f131563d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/how_did_imperialism_affect_britain.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/xoxitoxopejodulizixedezag.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/medical_reimbursement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/virimodatevagiti.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BC 4848 bytes
SHA-256: 6002e79b14997e121d0451afcff8f93fb78edad0926a915b34288fb994fbe4e3
font_01_sfnt_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 11416 bytes
SHA-256: 55d138c13ee9b4591d094d57b91c185b9d9af7f5b0a5cf5d660f751fe55fe6a3
font_02_sfnt_off00010859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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