Malicious PDF — malware analysis report

Static analysis result for SHA-256 365ba1fe07f651ec…

MALICIOUS

PDF

78.8 KB Created: 2021-03-27 23:20:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7d5337c19bf4ad5ebfede7adadd92a5 SHA-1: 1f8092bd39f519bd96124ba24d35ca10008ccb42 SHA-256: 365ba1fe07f651eca1f219642baec279f6775f03ac19906414339a5b2ffcb2d1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple engines, including ClamAV, and exhibits characteristics of a link farm. It contains numerous external links, with one prominent URL pointing to 'nipisod.ru/strik'. The document body, though heavily obfuscated, suggests a lure related to statistics PDFs, likely intended to redirect users to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=examples+of+descriptive+and+inferential+statistics+pdf
    • https://cdn-cms.f-static.net/uploads/4405687/normal_604dcbed0bae6.pdf
    • https://gugukufetufa.weebly.com/uploads/1/3/4/3/134337187/xujemimekosi-vikavuliwiga-vutibaz-tadoxe.pdf
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/d6a2bbd19.pdf
    • https://static.s123-cdn-static.com/uploads/4413866/normal_6002dd82d8e53.pdf
    • https://cdn-cms.f-static.net/uploads/4405945/normal_60502ff84e2ac.pdf
    • https://static.s123-cdn-static.com/uploads/4423700/normal_5fecc12673138.pdf
    • https://linazigamatamab.weebly.com/uploads/1/3/1/8/131856602/0824590.pdf
    • https://valodoxajub.weebly.com/uploads/1/3/4/4/134435871/jorukamazukutumowene.pdf
    • https://cdn-cms.f-static.net/uploads/4381081/normal_602b02bb80e77.pdf
    • https://cdn-cms.f-static.net/uploads/4480893/normal_601a82b7a00d1.pdf
    • https://cdn-cms.f-static.net/uploads/4482638/normal_60443ea195730.pdf
    • https://baliwiwun.weebly.com/uploads/1/3/1/3/131380001/ruvuvasedoj.pdf
    • https://cdn-cms.f-static.net/uploads/4454184/normal_603e248386b47.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_0600e12bebde4cec8828d4f7b7122f2a.pdf?index=true
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_f9288f0f2a9c42dc85ca4160e794a694.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ab183322-94bb-4700-beb4-949fc3d70f37/nutrition_sixth_edition.pdf
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_66084a58bcd546a4adf20cd8f4a19acb.pdf?index=true
    • https://ff87c8b5-ca28-4ac0-94ba-218234037d87.filesusr.com/ugd/1d4e4f_8a003302731a4a43953c9bc99be6f839.pdf?index=true
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_a288b265ae9f4a8ab4aa448071678014.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9b88c5cb-cfb0-4791-a23a-62deffa0dad6/gefuxikepipi.pdf
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_293247e5a68c4518ac789ff75838ea96.pdf?index=true
    • https://uploads.strikinglycdn.com/files/772b1247-5a3e-4a91-a5c4-d3982b15895e/gurerijatabedudav.pdf
    • https://uploads.strikinglycdn.com/files/2e11db10-a9c5-40a8-9b75-e0cb047d48a3/44262658939.pdf
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_be4b6b93b66a43768965eb4f915d4ddf.pdf?index=true
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_c6957e0af0f74defa93d440dde369cb1.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f5.bin
03b9844be270f90bad3ab9fbf368a3adbbb50c588d14cdaecb3c76ac7dfc0966		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 5384 bytes
font_01_sfnt_off0001083e.bin
84eaa5a238c3b5c39275a76484a40f6edf498bd4c53faba795fe6354a6348d96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 10600 bytes

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