Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2868386754ad8e…

MALICIOUS

PDF

67.5 KB Created: 2020-11-14 20:19:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ecdd245e5ca8fe6570e4465460c53bc SHA-1: 144ebdf30b954c2e45420eb4ed4474a54156f5b5 SHA-256: 2c2868386754ad8ef4214cd4abdc303595ed8367503afce5d0b7e13a69ddce9a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and one prominent URL pointing to a dictionary download. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=bangla+to+english+dictionary+pdf+free
    • https://cdn-cms.f-static.net/uploads/4374540/normal_5f9b2300cd36d.pdf
    • https://xironudobavus.weebly.com/uploads/1/3/4/4/134461104/mojufa_forixudi.pdf
    • https://cdn-cms.f-static.net/uploads/4401712/normal_5f9a6de2a9413.pdf
    • https://bopiwode.weebly.com/uploads/1/3/4/3/134367631/kosamevup-sodum.pdf
    • https://cdn-cms.f-static.net/uploads/4413465/normal_5fa78a46086d8.pdf
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/3870670.pdf
    • https://fiwimojulo.weebly.com/uploads/1/3/4/5/134525916/budunabaselef_lilebi_zuxur_sopujum.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/vunidixeviro_xitosujitupile_kadape.pdf
    • https://cdn-cms.f-static.net/uploads/4410679/normal_5fa12cffe5dd3.pdf
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5f92a8c181957.pdf
    • https://cdn-cms.f-static.net/uploads/4451753/normal_5fa9a4bfdcd28.pdf
    • https://sagoxanoku.weebly.com/uploads/1/3/4/3/134350044/74e3fcb7f7f2a16.pdf
    • https://cdn-cms.f-static.net/uploads/4369656/normal_5f93505fd46fb.pdf
    • https://sinonulu.weebly.com/uploads/1/3/4/6/134654736/53ffa1a4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fuwawibu/rupol.pdf
    • https://s3.amazonaws.com/xamapebonijos/zinivazavel.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb48.bin
48341da86a8cd33953e95bc18396d2544f029c28db28631115e17a163c23ef65
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB48 5568 bytes
font_01_sfnt_off0000de41.bin
f29c763dead907f94e8f11d13d181bf35555a6c332942dc2d6aa06d26e1b60a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 10116 bytes