Malicious PDF — malware analysis report

Static analysis result for SHA-256 142cd9b2cdc06ed4…

MALICIOUS

PDF

84.4 KB Created: 2021-04-27 15:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c41ed05fd03f39f19184a9a5f986912e SHA-1: a9d88250e709e14bbc63ef44be7af53e590a2a47 SHA-256: 142cd9b2cdc06ed4df66fc170e4654a8c1f567b736d59c80d23742ee073f29ce
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/strik?utm_term=why+is+the+red+light+flashing+on+my+smoke+alarm PDF link annotation
    • http://worozoxiw.sportsontheweb.net/gavom.pdfIn PDF document text
    • http://wosozage.mypressonline.com/is_there_a_24_hour_walmart_open_near_me.pdfIn PDF document text
    • http://zitarekatinupas.sportsontheweb.net/arfken_mathematical_methods_for_physicists_6th_edition_solutions.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/how_to_add_shop_in_wix.pdfIn PDF document text
    • http://omynutural.space/66216957047i1z4x.pdfIn PDF document text
    • http://bluebadge-support.com/latitude_e6410_wifi_driver_windows_7glzhe.pdfIn PDF document text
    • http://top-agent.ru/1487183257300yd0.pdfIn PDF document text
    • http://mazikopipovix.mywebcommunity.org/1464022419.pdfIn PDF document text
    • http://kimisorunutom.medianewsonline.com/prepositions_of_place_in_the_city_exercises.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/14509096610.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cabf6d7-7b92-4f1b-b97d-b06513cfdf48/jekogurevodi.pdfIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_5485fc39bcd0443eacb8759773c9f1e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2adef334-54a5-4725-b22e-eee2b61ebca0/39614580293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1abbe3dc-a75a-4183-ba33-35695e12c04d/29632539567.pdfIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_8f1df51eb09d4c8d824a6ac8052b3477.pdf?index=trueIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_dc32cbc6d8384e4b8b507a72bcf21d21.pdf?index=trueIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_c8fb2f7c366640a5838b3370f55834b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/65762b2d-1150-418b-aa04-80db9a6b1437/12972380693.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/33999062331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40bee6c6-e02a-4718-8662-b37e6d14fff6/5th_grade_spelling_worksheets_free_printables.pdfIn PDF document text
    • https://d397443b-80d0-4e74-967c-4ce830ee3754.filesusr.com/ugd/0a76f0_cc1bd0a66cb44cf39a91467ca2c98d5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/how_to_catch_a_good_man_and_keep_him.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4F 5500 bytes
SHA-256: 09044586fa41bfc28ce30dcd69e2071ab29c3334ba64fd57e4bd6b8e9499224e
font_01_sfnt_off00011cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF1 10920 bytes
SHA-256: 4f92401c1dab3fb0f327a424852713260a01625f228cf4cc7a3aa4b5c0eadd12