Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d67fbac6096d26…

MALICIOUS

PDF

76.5 KB Created: 2021-03-29 22:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a29249dde16526f2e0a7df511d4cc4c SHA-1: 20aae6973904041e419eccc795fee726ff0d612e SHA-256: d1d67fbac6096d2624f373c013d09126d2386552725048cd0602e513d92a6bbf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The primary external URL, https://nipisod.ru/strik?utm_term=download+acoustic+guitar+tutorial+videos, appears to be a lure for users interested in guitar tutorials, likely to redirect them to a phishing or malware site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=download+acoustic+guitar+tutorial+videos
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/7111807.pdf
    • http://nudevego.iblogger.org/wedding_anniversary_invitation_card_templates_free.pdf
    • https://jorojesa.weebly.com/uploads/1/3/4/8/134861508/lesedezodaxevigo.pdf
    • https://zelubofiwexuf.weebly.com/uploads/1/3/4/2/134234915/7261284c0105.pdf
    • https://retevewaluwur.weebly.com/uploads/1/3/4/6/134600892/3291408f.pdf
    • https://dapemoko.weebly.com/uploads/1/3/4/6/134647299/1189597.pdf
    • https://pupadidaf.weebly.com/uploads/1/3/0/8/130873798/6967769.pdf
    • https://zakutawevuvukug.weebly.com/uploads/1/3/5/9/135970657/4493881.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://javuturevof.rf.gd/sat_score_range_2019.pdf
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_a8445708af7c4f579ef4fced33898f2b.pdf?index=true
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_63c0c43778264e4db0f3c269fb9ec7b8.pdf?index=true
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_eff1065aef204fe391c0800766fad6dd.pdf?index=true
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_e2b413d40aec43a3a2b98989028dc1f0.pdf?index=true
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_cc4cab77cf214cbe99c9796f06090400.pdf?index=true
    • https://4f7f339c-9ee9-4921-a7ad-794169edd555.filesusr.com/ugd/fea72b_6d510bd627e5463ba81b097cdbf0ba5f.pdf?index=true
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_20bdf5d5658e492c83325f2c95094332.pdf?index=true
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_00cd03a9593b4ed98716c8403a1392d5.pdf?index=true
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_cfdf26cfc7034a2daf09ffb3855cc191.pdf?index=true
    • http://fowewimoseno.epizy.com/babine_lake_fishing_report.pdf
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_5fe3858121d940d087be7912947653c0.pdf?index=true
    • http://laroruteze.epizy.com/64046567563.pdf
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_7235dcd9e3194ea2820af9554e62a29a.pdf?index=true
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_ea7546113f9a4e3d80eabab911a1661b.pdf?index=true
    • http://pederufe.epizy.com/advanced_business_vocabulary.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_off0000ec38.bin
275be8d6ed0b5756a35866d7cd2590714c8e1c300dca8e7798b952e43768883e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 5256 bytes
font_01_sfnt_off0000fe46.bin
b9c8614b6ba4e8ff40e903ff43b9d2b6066d28e8fe397d3702a128760a349cbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 11172 bytes

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