Malicious PDF — malware analysis report

Static analysis result for SHA-256 4585f402291f4f46…

MALICIOUS

PDF

77.2 KB Created: 2021-01-06 04:50:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4713e21280872d8ddd860fcb35f73f6d SHA-1: d825838dfa10b37d75c12ec5fc6675aa023d1893 SHA-256: 4585f402291f4f463a21ec8578d7e0e5125bd212e658072ac4e06afb2a9eb2dc
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'traffset.ru', which is likely the destination for the phishing attempt. The document body, though heavily obfuscated, suggests a lure related to online math tutoring.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://traffset.ru/aws?utm_term=online+math+tutoring+platform PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495999/normal_5fc1d6df97088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383800/normal_5f9ab8be470f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454163/normal_5fb947689081a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369663/normal_5fc5cb0fb8c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459058/normal_5fdaf4287abe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f92003ae1970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_5f905691ca133.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/0343c8e2-4be1-4256-9aa4-93a67cf927a3/air_attack_hd_lite_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/panorama_360_camera_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/94962098259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d7a035-2684-4304-af7a-6338b20cd817/48522071389.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/heart_failure_treatment_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/70810347659.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/kanulotavemelemotefore.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_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 5164 bytes
SHA-256: a1abbe9f116e13490cf912037184c36fc1e06d7562f5d14c19d0741e01e707ec
font_01_sfnt_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 10736 bytes
SHA-256: 4ffbdd2125246f1637e9a9154b4b8f822af290569c25ccc0d9b6c58237026c69