Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02f897379bbf574…

MALICIOUS

PDF

74.9 KB Created: 2021-05-12 01:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1892aeb560cb87c065abdae556983595 SHA-1: e1e14d8087592bd03da43da2ef7906f259ecc3c0 SHA-256: c02f897379bbf5749d2686c4e35f25a49647b8368cd090fca71947f949f809a5
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, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this attack pattern.

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://pelibifir.ru/strik?utm_term=suunto+core+all+black+bandje+bever PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387433/normal_6013c2677843d.pdfIn PDF document text
    • https://cdn.sqhk.co/fepogosu/0aQS3We/72019224370.pdfIn PDF document text
    • https://fupesatufijipaf.weebly.com/uploads/1/3/2/7/132740914/wafidunalo-ripezom-fafasif-ludobavoxok.pdfIn PDF document text
    • http://sakipewo.22web.org/chinese_and_english_nursery_rhymes.pdfIn PDF document text
    • http://leniwatojetojem.medianewsonline.com/passive_assertive_aggressive_communication.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/5009164.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/ezNvyrb/alienware_monitor_2721d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380084/normal_5ffcb9a03191a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465687/normal_5fd799ad76e97.pdfIn PDF document text
    • https://puzuzabijil.weebly.com/uploads/1/3/2/8/132814257/xijerojegakubapib.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/lacrosse_shooting_drills_for_beginners.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zezofakarol.myartsonline.com/28202068813.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/how_to_get_gamestop_coupons.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_1b94c22f3a4f4dd584ff3abd5c0a0e2c.pdf?index=trueIn PDF document text
    • https://ed8cecbe-9888-40ab-9384-4b5b2efda5e6.filesusr.com/ugd/22dd42_fa4efd180c194f86b44d49471f59471b.pdf?index=trueIn PDF document text
    • http://xeludum.rf.gd/12923528743.pdfIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_05a25366fbd7483db088f0cd3c6c32e0.pdf?index=trueIn PDF document text
    • http://kopuperoki.epizy.com/android_google_maps_language_settings.pdfIn PDF document text
    • http://kususen.myartsonline.com/hero_of_hacksaw_ridge_book.pdfIn PDF document text
    • http://wevaxelim.rf.gd/rekoveputaguvasofad.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_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 5196 bytes
SHA-256: 282f010cf6c4d14645739c8fbc6f7992bf9962632166f4316a88cd22eb71129d
font_01_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 11728 bytes
SHA-256: 28b87365cb3d299212efbe8ea7cbcb56b51ae0a6ff4cd086a86748349f438ed5

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