Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d46d9730db4b3d…

MALICIOUS

PDF

78.0 KB Created: 2021-03-25 07:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94e8db04c2224027ceabc909e5adda49 SHA-1: d6870d1019fc5a836ad6e607dfcf0225775ad1ec SHA-256: f8d46d9730db4b3dd6367f110b6ac54132a079f7808187c1331dfdd3ee27f56e
176 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. It contains numerous external links, with a primary suspicious URL being https://pelibifir.ru/strik. The presence of a callback lure suggests a potential social engineering tactic to trick users into engaging further. Although no scripts were directly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pelibifir.ru/strik?utm_term=blue+jackets+tickets+account
    • https://cdn.sqhk.co/kigaratak/jdhgY3P/2508038550.pdf
    • http://fupemagis.mywebcommunity.org/full_body_test_check_up_list.pdf
    • https://cdn.sqhk.co/dolitife/fgeQB6G/81909240626.pdf
    • http://kuzexamipapoxip.medianewsonline.com/war_of_the_worlds_2019_tripod_sound.pdf
    • http://vaxenovutejuzid.sportsontheweb.net/the_tattooist_of_auschwitz_full_book.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2d86eb93-c0fd-49f3-b8bf-9635daa07f88/17604133785.pdf
    • https://uploads.strikinglycdn.com/files/4ba53525-3c81-4924-a040-37119fc5dd27/35075724715.pdf
    • https://uploads.strikinglycdn.com/files/4a026816-9918-4dff-a62b-f8ea367be14d/how_to_mind_control_someone_to_love_you.pdf
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_59ae28aff55d4a17be2fff769cd2e6e6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7841e850-a09b-4742-bcfe-44ef5283cb2b/68433766188.pdf
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_12d9b38f45284cae8d2153c708b5920f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c1f0c770-c8d3-4833-849a-c6292d59ab53/murifedaxibok.pdf
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_9ed7058976b541ccadb5eddaeb9e6c48.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e875d5f0-c5d4-44b4-b22c-2ea14874e6c9/mofidejiga.pdf
    • http://vupifokixen.rf.gd/23833678138.pdf
    • https://uploads.strikinglycdn.com/files/c974b10d-7554-4d86-b08c-f4672aebe478/doliroropoxufuxib.pdf
    • https://d4a58959-25bc-41ae-a48c-99f47e3c4711.filesusr.com/ugd/4dab1e_e53572bf17574ea18b8dbf551d8b3c4d.pdf?index=true
    • http://rusesav.rf.gd/greenery_football_game_apk.pdf
    • https://uploads.strikinglycdn.com/files/49160827-84b9-4fb5-9392-8452aa77a574/salupemawutozikosaromebuk.pdf
    • https://5a20c861-23fd-468b-888e-078c5342874f.filesusr.com/ugd/924841_e22188fb4bb54c8fb42b8ae7d0950ba0.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e583.bin
2be9020abdc2de16e72d4887864a01068cd3138a0482a9ca4e277c61ca3876d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 4768 bytes
font_01_sfnt_off0000f5c7.bin
5225320ec844186d7d661eeb32257334e6a763c4c1f53c97f52b8f5dafa39fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 12272 bytes
font_02_sfnt_off00011b7e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7E 4324 bytes

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