Malicious PDF — malware analysis report

Static analysis result for SHA-256 07f777c558682256…

MALICIOUS

PDF

89.7 KB Created: 2021-05-15 00:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: db6f762ddbbce5512e79a8f95b7579e1 SHA-1: e1340ba30ffe11bd95e947cd2561756e64669554 SHA-256: 07f777c55868225680bb9faba2835ee2254966f0f85f1c595ba017b5baba11e4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized PDFs for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=anselm+academic+study+bible+ebook PDF link annotation
    • https://cdn.sqhk.co/jijipidub/hjxgdmw/ayyappa_swamy_songs_mp4.pdfIn PDF document text
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/1433644.pdfIn PDF document text
    • https://buxarurusej.weebly.com/uploads/1/3/1/8/131856129/pugem-jimomija.pdfIn PDF document text
    • http://aycotoro0.xyz/fojuzesazototevubiviwsarqy.pdfIn PDF document text
    • https://gijudopit.weebly.com/uploads/1/3/5/3/135321477/movanevokejux-vozez.pdfIn PDF document text
    • http://triple-doska6.club/can_you_take_your_drivers_test_during_covid_19jqwss.pdfIn PDF document text
    • http://alfa-quest.ru/who_is_lunas_father_in_harry_potterdd21x.pdfIn PDF document text
    • https://fevapeju.weebly.com/uploads/1/3/4/4/134468187/suwozupok.pdfIn PDF document text
    • https://farazekij.weebly.com/uploads/1/3/4/3/134379469/sopavolofobu.pdfIn PDF document text
    • https://dekixemexiline.weebly.com/uploads/1/3/4/4/134497281/pesonagofogodazozes.pdfIn PDF document text
    • https://zokuxupan.weebly.com/uploads/1/3/1/4/131412362/pivofazoz.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/j6R8iiU/samsung_level_bluetooth_headphones_price_in_qatar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9322b276-b6df-4e82-a449-48e58c7b1cf0/sukixodugajopisudaxuzir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b05a0ec9-a069-4b30-8786-339a0f9e300d/novejedobakako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3fc8b71-be2d-4262-9059-a0db6677aa59/jefujavebofizitew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87f46fce-1dd3-451a-a9b6-83fc9eaa8aa6/dafiwadaragolirafidopowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52b10a9-156e-433a-8a9f-758a9d398632/89107195098.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_off00011e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4A 5284 bytes
SHA-256: 0fd1cb05ed6297998b934d9920c440453490722561e5644b914ab6383cbcab17
font_01_sfnt_off00013037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13037 11672 bytes
SHA-256: 69eaf50603ba7bdb7307d8a9897e19ef8b4e1b067b307e3648ab85af78dd0e9d