Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cd261309d46cf2…

MALICIOUS

PDF

78.2 KB Created: 2021-01-06 16:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c80c1231a36fd9dcf439973ce60e925c SHA-1: 52edbfda43d327d744ec8609ca08c7dc9689b03e SHA-256: a3cd261309d46cf28342cbc3fe89e56d862e1bdbabff4750ae5de9d29ada7140
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'mechanical engineering reference manual'. The presence of multiple PDF links and a critical heuristic firing for malicious redirectors indicates a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=mechanical+engineering+reference+manual+index+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4372371/normal_5feba5fd67bd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422382/normal_5fe9d7169b7e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426813/normal_5fdb59af4fa63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460946/normal_5fe7db26d726f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378618/normal_5fcdacf5f0e66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408190/normal_5fdc42159fa8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459774/normal_5fdf5a6e86df7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381752/normal_5f9dd08d34996.pdfIn PDF document text
    • https://xumefuzodagugud.weebly.com/uploads/1/3/1/3/131384373/kibopu-sirujirusedi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384482/normal_5fd83e5fd7c68.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/votawawo/bennett_mechanical_comprehension_test_download.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/cheats_of_gta_san_andreas.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_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 5464 bytes
SHA-256: e17b07aca6b3488e39a0c2c03270c713269f9baea70fb819417991dfbc09ee5b
font_01_sfnt_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 10472 bytes
SHA-256: 4de267aaabe033cbdc313f0d8d4d60fd0c1c2d75e08e5271ad1b1f181e7ed724

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