Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a12070a1332a46…

MALICIOUS

PDF

79.1 KB Created: 2021-03-14 17:56:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fae2f5aaadc6f57f19924c91d4814973 SHA-1: 55df3e1c89be3f673e819c148826533872131bb0 SHA-256: 77a12070a1332a46eeb5bb2b34ac993e54d529bbed30f221fc9bfb1f51d27100
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to game cheat codes, directing users to a URL that likely serves as a distribution point for further malicious content.

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://golowaki.ru/wix?keyword=gunblood+cheat+codes+unblocked
    • http://tosefabebiribow.scienceontheweb.net/12857965458.pdf
    • https://static.s123-cdn-static.com/uploads/4383160/normal_5fce459e0f210.pdf
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/tomapi.pdf
    • https://cdn-cms.f-static.net/uploads/4477629/normal_5fda47168b177.pdf
    • http://xomunuxeju.sportsontheweb.net/how_to_calculate_exchange_rates_in_excel.pdf
    • https://nubodizigo.weebly.com/uploads/1/3/5/3/135346475/9a6cde55f.pdf
    • https://jasujidavoja.weebly.com/uploads/1/3/4/7/134770870/7720975.pdf
    • https://widosogepe.weebly.com/uploads/1/3/3/9/133986955/1dce5c3022b4.pdf
    • https://static.s123-cdn-static.com/uploads/4488581/normal_5feea1c3bba5a.pdf
    • https://cdn-cms.f-static.net/uploads/4457848/normal_600b94c1e9bd7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zepifudoxapo/solving_inequalities_worksheet.pdf
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_588f0c43304f40d5b572fe526d2a3729.pdf?index=true
    • https://c0a42e0f-4cce-4e1b-84a6-2a5440198d67.filesusr.com/ugd/440b6d_602a9109283341b18f6a21786570f2e2.pdf?index=true
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_f15c78dc2ad84561969c795b5d47111b.pdf?index=true
    • https://s3.amazonaws.com/fixararololu/88044611202.pdf
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_5ca03417cdbd4a528d23f2f6380e113b.pdf?index=true
    • https://s3.amazonaws.com/debamijizozexo/24549603992.pdf
    • http://jagomizaf.atwebpages.com/blood_relation_reasoning_questions.pdf
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_9c55ef0b14514546bea15ce90878d083.pdf?index=true
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_2e95bf0adb314e4f83bbf6b600f07241.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_off0000ea99.bin
abec18c828b4e8be0b20f14d1778467067b803f242e26bbe1590119d080007cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 5000 bytes
font_01_sfnt_off0000fb90.bin
0b2d76c5e4147e817bcd1081388d487ea31775c3d2692c6ec18d0a290ed281c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 10472 bytes
font_02_sfnt_off00011f78.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 4324 bytes

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