Malicious PDF — malware analysis report

Static analysis result for SHA-256 356f9c61ef9c90ec…

MALICIOUS

PDF

101.2 KB Created: 2020-11-18 05:29:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c589ea8884cc190b1dae4f3070715f77 SHA-1: ba842551aac4b9083243ef310c218d183e3e81a9 SHA-256: 356f9c61ef9c90eca575d6d5dc2cf250f72d5818ed8ddc398acb02c60942f582
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a significant number of external links, with one heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM'. This suggests the document's primary purpose is to redirect users to potentially harmful websites, possibly for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points towards a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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://trafftec.ru/123?utm_term=kickass+tor+search
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/fozanozadafor_pobuvudimozexur_vopivewevugiv.pdf
    • https://valakafugajebe.weebly.com/uploads/1/3/4/3/134330742/0957cbcbc1c.pdf
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f8b2f80dc782.pdf
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/zofipemekiziwejujuz.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/xenemavurinap_jokepirewiteda_fijalezej_gemewije.pdf
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/7249339.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muvemasoxaji/68509234680.pdf
    • https://s3.amazonaws.com/remuv/dozebovizazipujigajo.pdf
    • https://s3.amazonaws.com/tugumeb/23625977073.pdf
    • https://s3.amazonaws.com/xeponodij/corner_liquor_cabinet.pdf
    • https://s3.amazonaws.com/dadupawo/pelikukiwi.pdf
    • https://s3.amazonaws.com/leguvefu/21876554528.pdf
    • https://s3.amazonaws.com/subud/zejetofuletifenimo.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_off00014c81.bin
e69e6d7eb588d008fb283816b31558e65694916c5c67479c2df117eb82fb496f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C81 4888 bytes
font_01_sfnt_off00015d1e.bin
6d180087aab5e574c55ee3f6de36d4511c61a22a387b9a5d27e65cf1403f2dc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D1E 13736 bytes