Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d73f86deb8f3815…

MALICIOUS

PDF

79.7 KB Created: 2021-03-30 10:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7994154347ba5684bb5f4528c7c3363 SHA-1: d72e213109b0554a6c8d2c74a930d2e71ec02c16 SHA-256: 2d73f86deb8f3815e3dc8a3fc09cf379b33dc3714e727bc7b61cda0430e287c2
214 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate it is a malicious redirector and a link farm, suggesting the primary purpose is to direct users to potentially harmful websites. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/wix?keyword=ffxiv+conjurer+guide
    • http://bupimobim.sportsontheweb.net/hey_jude_piano_accompaniment.pdf
    • https://cdn.sqhk.co/vekuperik/bYxjbhi/botuxisedizenib.pdf
    • https://mutefalififide.weebly.com/uploads/1/3/1/3/131383766/13ea0a68e6b3b4e.pdf
    • https://cdn.sqhk.co/budafitanu/iijzloV/bass_booster_software_for_pc_windows_8.pdf
    • https://cdn-cms.f-static.net/uploads/4382778/normal_602d87a6b2763.pdf
    • https://cdn.sqhk.co/kavuzoda/ibjbszi/2841639224.pdf
    • http://jonotijero.medianewsonline.com/xarenomafojomonanupunafe.pdf
    • https://cdn-cms.f-static.net/uploads/4488141/normal_60468dce994e4.pdf
    • https://sogakuguw.weebly.com/uploads/1/3/1/4/131453515/xefijo-jelilosuw-gogezimat-junomexo.pdf
    • https://cdn.sqhk.co/roturoda/gP6dTGF/64426038784.pdf
    • https://cdn-cms.f-static.net/uploads/4378619/normal_60592087197c0.pdf
    • https://cdn-cms.f-static.net/uploads/4369334/normal_6056fd8453f82.pdf
    • https://cdn-cms.f-static.net/uploads/4481831/normal_60257acb0495f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_d29c98ecc1e244499f43d1f115f21c72.pdf?index=true
    • http://juvofirodeburu.epizy.com/android_broadcast_receiver_manifest_example.pdf
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_41930ab226fa4966ba0b574344fb6842.pdf?index=true
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_cb16b447852144b99d310d84ed1c6ac1.pdf?index=true
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_96a2288d03cf4dabb11256668785d712.pdf?index=true
    • http://xazulagevam.rf.gd/football_manager_2016_editor_data_download.pdf
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_242f75a690994f3b920bffc94de41673.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_off0000fac8.bin
04640fcae762424bf909d7dab3afb2c54ab25a6c8c9d72377c3947e62f8f66be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 4928 bytes
font_01_sfnt_off00010bb3.bin
f7fc4abbf9c94d0bf05dda6054d61d7d6427be3954ced31c7cb087387a6e83ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 11276 bytes

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