Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36394c75e6fb644…

MALICIOUS

PDF

76.1 KB Created: 2021-04-11 14:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 134bc985bf53626f6d6528e4e6fbcd4a SHA-1: 733258a70d4da81729859e040b1a47398d25693e SHA-256: b36394c75e6fb644330c1654c75fdec670aff2e07cb277aae0cf65621d0affcd
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=can+i+charge+my+kindle+with+a+samsung+charger PDF link annotation
    • http://hairsprof.ru/lurokapomevarujowuxirqdgz.pdfIn PDF document text
    • http://mobile-media.moscow/wopow6vwln.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/ejbgchh/mofokogazome.pdfIn PDF document text
    • https://nodemudikukurev.weebly.com/uploads/1/3/5/3/135348567/3280281.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381737/normal_5fc73af1c607e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459341/normal_6019c6f024cb5.pdfIn PDF document text
    • https://jabasamivesapev.weebly.com/uploads/1/3/4/0/134041177/wirikemulelitulu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_602452dca1804.pdfIn PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/xoboxular_sosolis_mizusa_witeseretez.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/cMjcfsq/diversity_and_inclusion_meaning_in_kannada.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/037b366a-0a30-4962-9e5f-50275fa00ee7/zolovuxetojakifaruki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6392486-5bc5-488f-8267-3170bde6ccb6/dyson_dc58_replacement_charger.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_8451bd2ce2354ea98db6b168cb1cacda.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce3b6f6d-6f27-400a-a11f-9ee733a47bb1/how_much_profit_do_pawn_shops_make.pdfIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_8a4cff475bd645119e85ae758fe70048.pdf?index=trueIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_3b470d4dcbd441259676b15534442982.pdf?index=trueIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_0c131a4979fe49eeb5e2dfa8b3c1d516.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/893aff2f-f00f-419f-9c4f-8b5ce90995a3/what_order_should_you_watch_the_harry_potter_movies.pdfIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_417de62a2ffe4dff8f54cad41e5a5289.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb575605-8a46-4cd6-945a-37afc59b7db4/how_to_use_knitting_machine_punch_cards.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_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 5516 bytes
SHA-256: e05b01c0f9903f48dbf423b67770345235f0d6e2b72ce74188b6afffe56671cb
font_01_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 10676 bytes
SHA-256: 96eac597b7d4604e092d7de0837e6db72aba0d81aa8b51407237cdf7d251361c