Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcab2857bacf790…

MALICIOUS

PDF

78.8 KB Created: 2021-03-27 15:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bbf356af2306891e221405ad9781debe SHA-1: dcd234a3cf2c3934f693961254a55514a9cc40b0 SHA-256: 5bcab2857bacf7906b81c006eaa3fd1ab218b0d2e246e9fff850468ad8b1afc8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a large number of external links, many of which point to SEO-optimized PDF documents, suggesting a link farm designed to drive traffic to potentially malicious sites. The primary malicious URL identified is vilenefex.ru, which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://vilenefex.ru/wix?keyword=gta+iv+mission+guide PDF link annotation
    • https://cdn.sqhk.co/baxalelizop/WaidXnr/membranous_labyrinth_anatomy_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/ojhhhhe/md._emu_1._5._37_paid_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/goFTHRb/free_wallpapers_for_laptop.pdfIn PDF document text
    • https://cdn.sqhk.co/fofanibiv/gYOidjf/janinipejebiligepusete.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/56433eb8-b217-4329-bc69-b9c9a9b3ba61/how_to_replace_samsung_microwave_light.pdfIn PDF document text
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_d73713d2e0004b2996f112afa0b3480c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gozifep/jersey_mikes_italian_sub_in_a_tub_carbs.pdfIn PDF document text
    • https://31c22a8d-7666-4461-b841-b648a8b197bc.filesusr.com/ugd/7dd30d_412d398221d34ad5a0a294740592bf70.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a36977a-334c-47ac-937f-611bec7d0a89/wubafotovoted.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/medians_and_altitudes_of_triangles_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/trading_strategies_forex_factory.pdfIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_e8f5be3e102e44b584a076789482f985.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawovojo/learn_android_tutorials_point.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_3ed7db5ca9404e6eafa8a28ca578a7cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcfb4fb8-1396-440c-a7a4-71d6945e71fd/wexelusotax.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/xusomoxiwaxekuzab.pdfIn PDF document text
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_a7f53b007e714e5aa189e04f92ca6580.pdf?index=trueIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_330e976705aa4aa097b0ed6277107747.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zugutixe/adobe_flash_player_29_activex_free.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_2dc2cc781dcc46de97b729f4d5383690.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_08976721ca514fc394a3a5b4e44e5320.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 4988 bytes
SHA-256: 7161f6dc23db449e7eda30c59aa82719c2650712aa0190ac34a7f7a2b957f0bd
font_01_sfnt_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 10920 bytes
SHA-256: 453c6f7faa780594d4ee9cb52140acfd4a9399135220f8f42cef0122ac9be18d
font_02_sfnt_off00011f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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