Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4233e0ac722807e…

MALICIOUS

PDF

75.8 KB Created: 2021-02-24 22:52:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 97a532616e1ceff231c0ba024a8ecc36 SHA-1: 22952dc2dda73bfd1a410b416f1fc697f05ada87 SHA-256: a4233e0ac722807e2e6f6801eebe9f884d0e1c8429ece0dbc7a0fec9dd40753f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains and subdomains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

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://jottigo.ru/strik?utm_term=can+i+charge+my+samsung+tablet+wirelessly PDF link annotation
    • https://cdn.sqhk.co/xaselavub/ijjamif/first_strike_valorant_na.pdfIn PDF document text
    • http://todayit.pro/aerial_photography_notes86ykb.pdfIn PDF document text
    • https://kuwuxezito.weebly.com/uploads/1/3/6/0/136090431/wegifanonad.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/jeRihIb/amtrak_auto_train_dining_car_menu.pdfIn PDF document text
    • https://piledefek.weebly.com/uploads/1/3/5/9/135966078/5782857.pdfIn PDF document text
    • http://arendagg.xyz/ddda_mystic_knight_guidei65pt.pdfIn PDF document text
    • http://salestore.pro/xobesogepasomodipevuhgr4d.pdfIn PDF document text
    • https://nabusaguvelono.weebly.com/uploads/1/3/4/0/134095838/41b8a7bd3.pdfIn PDF document text
    • https://jivupofa.weebly.com/uploads/1/3/1/4/131406879/durijes.pdfIn PDF document text
    • http://smartbright.club/99292092058j5fsz.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/60421306250.pdfIn PDF document text
    • https://zigajimimokok.weebly.com/uploads/1/3/1/3/131383588/1061744.pdfIn PDF document text
    • https://kibidabusiben.weebly.com/uploads/1/3/1/0/131070702/3274841.pdfIn PDF document text
    • http://vigastlens.xyz/read_the_four_agreements_onlineghm1h.pdfIn PDF document text
    • https://komibaxes.weebly.com/uploads/1/3/1/6/131606619/9301472.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/gdQyI1J/splash_canyon_crystal_caverns_level_39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 5452 bytes
SHA-256: 59822adadcddad9c11e672e598846e598e6907110a240fd0dc099a381a59184a
font_01_sfnt_off0000fee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE3 10192 bytes
SHA-256: d30d2403c5a5b03b8b1adcda04f66f5e7c9a7801fc9000aec8e9e4ff407ae350

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