Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8be4cfa8c540be4…

MALICIOUS

PDF

81.7 KB Created: 2021-04-24 17:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c1a1c16a0bc2590c6370660b300bd43d SHA-1: e09d39411219efb735ab4609843804295967f7b4 SHA-256: f8be4cfa8c540be4d2f3b8b60b34024f514e8954d695c8542092790c68b6cc40
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, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document, possibly leveraging embedded JavaScript for redirection.

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://xajibur.ru/strik?utm_term=how+to+calibrate+thermometer+probe PDF link annotation
    • https://cdn.sqhk.co/wogokodu/6Cjhhdl/wepafalapixitemob.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/5Vjfjjc/mojefofa.pdfIn PDF document text
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/4160142.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwuwigo/C2DcLgj/fast_food_specials_near_me_thursday.pdfIn PDF document text
    • https://zakemobuka.weebly.com/uploads/1/3/0/7/130775752/328c23e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_60260d822b067.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/hLjdhik/talepuxedolegofokapegi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496607/normal_5fe560679d57b.pdfIn PDF document text
    • https://rodagekutav.weebly.com/uploads/1/3/5/3/135313742/4851389.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/emge6je/knock_down_the_house_netflix_documentary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467910/normal_603f1004a6223.pdfIn PDF document text
    • https://wupovejiti.weebly.com/uploads/1/3/2/8/132814541/7b50ef0.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/nijifivipakati.pdfIn PDF document text
    • https://migawonakizize.weebly.com/uploads/1/3/1/6/131637147/5b5372be87f.pdfIn PDF document text
    • https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/perotisal_pomob.pdfIn PDF document text
    • https://cdn.sqhk.co/gulizate/c8xD9jf/76456306973.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/jevdjfl/funny_gifts_for_friends_diy.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/1e70ec43-0888-48dd-b192-672eff370a65/jinimezap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/788e1c86-39d6-426b-9364-924a9a4c9431/magic_chef_food_dehydrator_470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/697fe466-2526-40f8-aa49-713f82a66ea4/30500913668.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_off00010242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 5188 bytes
SHA-256: a77712d3ff02b9d556fade04b7f96f52e4ab784062c03523bd83f1522ca95ea2
font_01_sfnt_off000113c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C7 11084 bytes
SHA-256: 8ed63e8e55061f47697b2ad9c3b57dfb757eba49f28e820faa1f11d8d2b6066a

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