Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f697e5dee39daa9…

MALICIOUS

PDF

68.0 KB Created: 2020-11-17 17:10:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 628f105da66e0a022d229a3108316ef8 SHA-1: b5d809db6fe8a0d3d354f5a6bc4fc5776d27a87c SHA-256: 9f697e5dee39daa92cc65b996fb533d8ca7a99b74bc9296e745ee56f09dfc3b3
126 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 identified as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, appears to be a lure related to 'triangle similarity proofs worksheet answers', intended to mask the malicious intent of the embedded links.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafficel.ru/123?utm_term=triangle+similarity+proofs+worksheet+answers PDF link annotation
    • https://kelutatu.weebly.com/uploads/1/3/4/5/134521402/f33b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454677/normal_5fb34716ec06a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_5f976a80eefc4.pdfIn PDF document text
    • https://lureriwoxefewu.weebly.com/uploads/1/3/4/5/134590368/kijegiviterebov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_5f8ce08bce80b.pdfIn PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/9580453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406820/normal_5f927abb21402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_5f954447c6e48.pdfIn PDF document text
    • https://ponekuxu.weebly.com/uploads/1/3/4/7/134747949/pebakevitumarasadek.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/43a349bf4de6ea5.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/e15f111a1112.pdfIn PDF document text
    • https://wabalunizuwa.weebly.com/uploads/1/3/4/6/134643533/168270ce1142e.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/a071d083-bad8-4897-8337-dd025c7ceb81/xerujavizaxupumexazatopuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996bf131-de68-4687-811d-158ea54828aa/gumelo.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/63068669751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59c95e7d-50ee-4262-8d80-fe4a2e198b9d/sovupugines.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_off0000b898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB898 5524 bytes
SHA-256: 49b50d2a09b15c14e70a654ef18d559d522496f8532772e079e2ab2e753e826b
font_01_sfnt_off0000cb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4F 10076 bytes
SHA-256: fbd2c1e3bf956eb1cc3d056ca3b36a86743f791c5ec9676a24c3669c05ec90f6
font_02_sfnt_off0000ee01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 16072 bytes
SHA-256: 3da9309f7c28e01a20d15285b754fad9116e6eb7744d168a0fff2950d6122081

Open this report in the interactive analyzer, or submit your own file for analysis.