Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd979abdd03be010…

MALICIOUS

PDF

72.4 KB Created: 2021-01-27 12:45:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b038c13c6e5553795137fab0ac64888c SHA-1: c77c0b5619d81567cc072483778ff95c6c6c9c01 SHA-256: dd979abdd03be0108960d0f78162b379a2aaffc7a9cf6fd81282d96f6405b97f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to redirector infrastructure and potentially malicious content, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the document's structure and embedded URLs are indicative of a malicious campaign.

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://yafferge.ru/123?utm_term=hinder+all+american+nightmare+songs In PDF document text
    • https://cdn.sqhk.co/dexasubu/yjcqCih/bomiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/PhjLJXT/97105340117.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/A3jc4Cj/gangs_of_london_trailer_season_1.pdfIn PDF document text
    • https://cdn.sqhk.co/wememiguw/Wjcmrig/rodudazemi.pdfIn PDF document text
    • https://cdn.sqhk.co/lirebirab/eDXgijh/pomapas.pdfIn PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/gofoxuzupesivugur.pdfIn PDF document text
    • https://fudiditinip.weebly.com/uploads/1/3/1/4/131453724/moziz_fodokosabinigeg.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/rhja3sn/ares_virus_game_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/zijjbia/pijotige.pdfIn PDF document text
    • http://limevekobo.iblogger.org/ammonia_refrigeration_plant_design.pdfIn PDF document text
    • https://cdn.sqhk.co/fabunavaxa/aJgjFzS/mint_tiny_house_company_canada_goose.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/megodipewukitoj/copernic_desktop_search_free.pdfIn PDF document text
    • http://nuxavezuzoja.epizy.com/mugulawikevoz.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/polosumes.pdfIn PDF document text
    • http://wosolebaxuwutux.rf.gd/62231647297.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/68795810800.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_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 5312 bytes
SHA-256: 3333e645c59417b49d026f7783cab0a4601dabcb67813ab6c7ea7f0b6975686e
font_01_sfnt_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 10856 bytes
SHA-256: ebe8766fcbd08d655ab999e74fc91a241ab4a18d1a8b7d1c0c013979c2a1409d

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