Malicious PDF — malware analysis report

Static analysis result for SHA-256 b748853058e13f92…

MALICIOUS

PDF

67.1 KB Created: 2020-11-10 07:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 50a0b2862f708a111dd34469aab02c21 SHA-1: 934c6cdf7db7f888b4e3574386791f60d5c364ce SHA-256: b748853058e13f922be2a94d19069c68736a1a53be5ded7fdb1d01470eddd8ef
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://trafffe.ru/strik?keyword=2005+infiniti+g35+coupe+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4394068/normal_5f909703ada2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f86f9047cadb.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/duxaxegidarexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_5f8e32a682ee8.pdfIn PDF document text
    • https://tizemafuniture.weebly.com/uploads/1/3/4/6/134636649/xedowe.pdfIn PDF document text
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/7227990.pdfIn PDF document text
    • https://nuzimalufugi.weebly.com/uploads/1/3/4/7/134705392/duwukama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393904/normal_5f9709ee475ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_5f8a0f6bb5aec.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/wiromanutenu.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/6e8fb2b5-01a4-472c-a919-34e596092bff/suxukigeliduwobor.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_off0000c440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC440 5528 bytes
SHA-256: a4c2eff101013f7350ce5e8b04b8a07fef222d8a800e2a8fb8bf4b948bbc9434
font_01_sfnt_off0000d70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70C 11872 bytes
SHA-256: 6adc177c67d026c359762cfaaa1d0437009e681a4c4c6476dff98bdc0ee4e48b