Malicious PDF — malware analysis report

Static analysis result for SHA-256 028c64ad79f96240…

MALICIOUS

PDF

79.2 KB Created: 2021-04-13 13:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b87b71dc44f086c9ad1a383d17ca83d8 SHA-1: d38ec5bfc4e759025c62d6a0601cda4b5e9fb83f SHA-256: 028c64ad79f962407632f81afae79b50d9b51095c144dc11259c5ca3f83a73eb
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 distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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 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://xezojetit.ru/strik?utm_term=how+to+take+a+leadership+assessment+test
    • https://fizalexajoridul.weebly.com/uploads/1/3/4/6/134662396/6565596.pdf
    • http://walawatomu.mywebcommunity.org/jevep.pdf
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/juxufinajux_ziduno_widinuzode.pdf
    • http://gefosezidubajoz.scienceontheweb.net/are_there_any_black_kpop_idols.pdf
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/komafaledasipute.pdf
    • http://nonowun.mywebcommunity.org/53318216233.pdf
    • http://eglo.club/nitojefaromuviwiwiwlt7xl.pdf
    • https://cdn.sqhk.co/devisofage/ehexHzs/posoj.pdf
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdf
    • http://itravelgr.com/673949230017qls6.pdf
    • https://wobanuwu.weebly.com/uploads/1/3/5/9/135959505/xigapaxiluk.pdf
    • http://bidizujimon.getenjoyment.net/techniques_for_capital_expenditure_analysis.pdf
    • http://dosijefa.mypressonline.com/zokorebugisafirox.pdf
    • https://static.s123-cdn-static.com/uploads/4413851/normal_6007ce03375cd.pdf
    • https://static.s123-cdn-static.com/uploads/4459791/normal_5fcc8ec8aa8d4.pdf
    • http://accface.in/how_to_answer_ethical_questions0x0ip.pdf
    • https://cdn.sqhk.co/vujenibolo/2cPA6Xl/kutamula.pdf
    • http://idealica-italiaufficiale.website/best_free_movie_apps_android_2019jnoja.pdf
    • https://cdn.sqhk.co/moxawitab/ibjbjbA/88010504251.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_f6c5b436c5c54c44a5b27285c43bdae6.pdf?index=true
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_7416269bc7a34482ab5f16b71479975d.pdf?index=true
    • https://6f46ab72-b8e3-4ec2-8f01-cb5d6491dab7.filesusr.com/ugd/9a120b_a2651f130beb429881b4c515c7a7c792.pdf?index=true
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_5de5c23fe5574323b113c3687671b81f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a8.bin
31c380bf0ddf2e731e37980788de0ace6d6f2040e49db5e8f64db548f7255175		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 5316 bytes
font_01_sfnt_off000109a1.bin
b44c9625615b22f7627a9ab5e7fd118cf11e43251475e432d52470391e4769c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 11268 bytes

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