Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4298bec31854ca…

MALICIOUS

PDF

72.1 KB Created: 2021-03-03 12:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: afed20914610f995e5a90c57098e1747 SHA-1: 94dbecaf0a9ce4b53123d9aa9dbcfc94820d11a5 SHA-256: 4a4298bec31854ca114ce662ff6e12e52514471782b8e31f8bcf1b183dcf4fb5
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, forming a link farm hosted on disposable domains. One of the embedded URLs, 'https://nipisod.ru/wix?keyword=army+promotion+manual', suggests a potential SEO poisoning or traffic redirection scheme. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://nipisod.ru/wix?keyword=army+promotion+manual PDF link annotation
    • https://jirogadipew.weebly.com/uploads/1/3/1/6/131606393/cec51e11e340b3.pdfIn PDF document text
    • https://bigifami.weebly.com/uploads/1/3/1/4/131407708/sumepe.pdfIn PDF document text
    • https://gekiwudev.weebly.com/uploads/1/3/4/7/134769606/suronin.pdfIn PDF document text
    • https://wepeweguwerixum.weebly.com/uploads/1/3/1/8/131856135/pejetudedo.pdfIn PDF document text
    • http://kamaz-ftc.com/juvorukijunejjlft.pdfIn PDF document text
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/db7a657b54894ba.pdfIn PDF document text
    • http://kodamup.22web.org/11721676127.pdfIn PDF document text
    • http://mon-cmbretagne.com/wuranevijetonobimak7yz.pdfIn PDF document text
    • http://vukogosapejofa.iblogger.org/kuvitubemegop.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/cannot_connect_jbl_flip_3_to_laptop.pdfIn PDF document text
    • https://zuriloteva.weebly.com/uploads/1/3/4/6/134623588/zexomekafeborama.pdfIn PDF document text
    • https://zudejuzire.weebly.com/uploads/1/3/2/6/132681250/tamujaselaj-tenewapigenikux-betewoxuruzo-diduzimofopef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/faxabota.pdfIn PDF document text
    • http://sezesub.epizy.com/evaluating_trigonometric_functions_of_special_angles_worksheet.pdfIn PDF document text
    • http://nuxumejaxumem.epizy.com/netflix_error_code.pdfIn PDF document text
    • http://piredesoki.epizy.com/ios_13_beta_1_ipsw_link.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_off0000df2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 4880 bytes
SHA-256: c849a5ba8eb287134579b7b517155047f8bb774a49b1da2512d83cc4f8324848
font_01_sfnt_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 10592 bytes
SHA-256: e875c2a9f8b7e074a59973ef056d7b06f3bce6b8f29c7d1424f1997cbed6db7e

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