Malicious PDF — malware analysis report

Static analysis result for SHA-256 506f071af1c8737d…

MALICIOUS

PDF

74.6 KB Created: 2021-03-29 07:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40125c737467f99ee06622ae9e274b6f SHA-1: dd402d54a3129b419a1c87c18007dd5dd2d093ed SHA-256: 506f071af1c8737db7b473a9b07fc5d21eb5c6ccb0df0e18e28b0c236969793c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely intended to direct users to malicious websites for phishing or malware distribution. The presence of multiple external URIs further supports this attack pattern.

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://ponafet.ru/wix?keyword=ls1+manual+transmission
    • http://teguruta.medianewsonline.com/diabetes_burnout_book.pdf
    • https://cdn-cms.f-static.net/uploads/4404750/normal_603e78733a9e1.pdf
    • https://cdn.sqhk.co/tobipamu/fighfhe/pathogenic_microorganisms_in_blood.pdf
    • https://cdn-cms.f-static.net/uploads/4388814/normal_605185c475ffb.pdf
    • https://cdn.sqhk.co/niwuwusogoxo/KhiznoF/zidomorinejipuv.pdf
    • https://vakevugulipew.weebly.com/uploads/1/3/4/5/134507067/1102506.pdf
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/bf75fa61e552.pdf
    • https://kenojitoxudu.weebly.com/uploads/1/3/1/3/131383977/08186a6f036b4db.pdf
    • https://ranemexamegen.weebly.com/uploads/1/3/4/4/134440137/dujumunubewagamasan.pdf
    • https://cdn-cms.f-static.net/uploads/4419633/normal_605d670a0aac0.pdf
    • https://cdn-cms.f-static.net/uploads/4417830/normal_605d48cabe0a0.pdf
    • https://cdn.sqhk.co/vilonunufuk/ieaCNAX/the_sims_4_money_cheats_2019.pdf
    • https://nodazijokavi.weebly.com/uploads/1/3/4/3/134315007/091170975fd.pdf
    • http://jixazepo.mywebcommunity.org/traxxas_tqi_transmitter_reset.pdf
    • https://tokawokemiw.weebly.com/uploads/1/3/4/7/134730305/9972827.pdf
    • https://cdn-cms.f-static.net/uploads/4420597/normal_605b5f5e90881.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0c7b1e5d-10e9-4c66-9a64-57e6babc74f3.filesusr.com/ugd/6b59ba_b4ce8f4fe7d8464d94be9a28095d9cce.pdf?index=true
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_0f670c0cbcb54f0caf6a4c38ebb72f21.pdf?index=true
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_80ce35f918754ff9941b54739de450c3.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_off0000e7f3.bin
42da2828b66963cb68d69aa3bad064cb266314d570ee7e1e7804d003228e4154		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 4824 bytes
font_01_sfnt_off0000f843.bin
23695788c42efac8c14b0e735c2ad1a37807d2c66b05c49e4560e772870692b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 10988 bytes

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