Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d2082e01fe5a7d…

MALICIOUS

PDF

78.4 KB Created: 2021-03-04 16:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5524ba8f1b7b27662d15dd500b216be1 SHA-1: 43d6553a83c3d1354bb55c773837760c502c4d27 SHA-256: 18d2082e01fe5a7d69598a04541b01e780c165fdc3408aa612aba9cca04609f7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'zajinet.ru', which is flagged as suspicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO manipulation tactic. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or a trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=how+to+say+no+to+a+man+without+hurting+him
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_255cda1c5dcd4efeb93ce94d1561f273.pdf?index=true
    • https://s3.amazonaws.com/baxekojojexusol/free_yamli_smart_arabic_keyboard.pdf
    • https://uploads.strikinglycdn.com/files/40e34088-a171-457f-abe1-a2db90f85525/80684811336.pdf
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_a4da0cdbb83842e6ad94971999d43800.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dfd842af-4b68-466d-8d5f-f589933b566f/what_does_an_absorption_spectrum_tell_us.pdf
    • https://uploads.strikinglycdn.com/files/7de5cd7b-3aa5-4608-8796-50c3c718dc83/pijepobofadolul.pdf
    • https://s3.amazonaws.com/vufuzewasi/iyengar_yoga_for_beginners_book.pdf
    • https://s3.amazonaws.com/robumuduluwise/91781154369.pdf
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_5cb87349ad22433bb3b005680fa5c653.pdf?index=true
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_b9158db779a34d9a93342f61451e5a52.pdf?index=true
    • https://s3.amazonaws.com/rojalexipokadaz/outlook_express_6.pdf
    • https://uploads.strikinglycdn.com/files/d4a8e3be-a6e6-4388-a55c-e73499426f9d/jack_lalanne_juicers_reviews.pdf
    • https://uploads.strikinglycdn.com/files/529b7d87-87a1-4eef-90d3-a84141cbfbd8/cen_tech_battery_charger_not_working.pdf
    • https://s3.amazonaws.com/zesixefe/fitafapisufekor.pdf
    • https://uploads.strikinglycdn.com/files/f0b13367-c01f-4229-8d58-ddf49d60937b/fisher__paykel_rs90au1_integrated_fridge_freezer.pdf
    • https://uploads.strikinglycdn.com/files/0fe7777f-79dd-415e-a1fa-6f42dcc66e0b/fima_klebaner_stochastic_calculus.pdf
    • https://s3.amazonaws.com/womirofop/kunatomomotejojikesowa.pdf
    • https://s3.amazonaws.com/napejaxosinages/the_vampire_diaries_video_download.pdf
    • https://s3.amazonaws.com/kisagoz/what_foods_contain_gluten_but_not_wheat.pdf
    • 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_off0000f697.bin
a0edf2b5f3334d7504403e2aee275203cdfb5ac1d32269cbc644ae7e24a6d1a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 5224 bytes
font_01_sfnt_off00010845.bin
0473ac199021b2f0fb656d0e4970ccbfff531d5e013d23f0442e7ce8f95bf8dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 10484 bytes

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