Malicious PDF — malware analysis report

Static analysis result for SHA-256 87203766ca2af84c…

MALICIOUS

PDF

73.8 KB Created: 2021-04-04 11:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b31628dabcfcf418cc4c32609a0e0f30 SHA-1: d1b271d1761ebcc4c0846016e6afdc05ba187e34 SHA-256: 87203766ca2af84c502d94f5d2e2a854c05b5cc070fa28deb0cd5c2fce6181f3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, appears to be related to a medical device manual, likely a lure to encourage clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/wix?keyword=thoratec+heartmate+ii+manual
    • https://cdn.sqhk.co/tuwisota/hiFiaFf/crack_adobe_illustrator_cs6_kuyhaa.pdf
    • https://cdn-cms.f-static.net/uploads/4465257/normal_602c5a660658c.pdf
    • https://xixebume.weebly.com/uploads/1/3/0/9/130969831/tedalosevebit.pdf
    • http://fezelegafefuv.mywebcommunity.org/42053766395.pdf
    • https://cdn-cms.f-static.net/uploads/4426085/normal_601de738c724b.pdf
    • https://cdn.sqhk.co/tegatiwuwax/tgjiejn/my_anime_girl_2018.pdf
    • https://buzelobuledu.weebly.com/uploads/1/3/1/3/131397981/kitusikumam_leziraja_repulos.pdf
    • http://lamaded.mywebcommunity.org/clases_de_compuestos_orgnicos_con_sus_grupos_funcionales.pdf
    • https://wisenuru.weebly.com/uploads/1/3/1/8/131856959/3679013.pdf
    • http://pobunav.sportsontheweb.net/xirulijove.pdf
    • https://zedasadexim.weebly.com/uploads/1/3/0/7/130775923/dufewejodokivezopug.pdf
    • https://cdn.sqhk.co/tenokesime/JWaZkhi/nail_art_supplies_for_beginners.pdf
    • https://static.s123-cdn-static.com/uploads/4449627/normal_5fc5e40a8199c.pdf
    • https://gilinolejokakis.weebly.com/uploads/1/3/4/6/134632374/0e87999152ad3b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_c8a221cc773e4fcd90cb90cb73ad1a16.pdf?index=true
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_eb1559d70c564faaa23a76f1074cad4b.pdf?index=true
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_a9923928ad094febaca3338f5b8351ac.pdf?index=true
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_19ebd503017f4fc4be9c7ae3bebcf408.pdf?index=true
    • http://xowuzaxu.onlinewebshop.net/cardiomiopatia_hipertrofica_obstructiva.pdf
    • http://rawegutidum.onlinewebshop.net/composite_material_file_download.pdf
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_bc1a77ad98914827b418101693a9be63.pdf?index=true
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_6a8ae49435664e81bdb7ca72fa51d349.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_off0000e42b.bin
154fe110d53039309f04408e9e32df08c08e04631fe969f7a441bfb955bed781		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 4812 bytes
font_01_sfnt_off0000f458.bin
7013edc49cb4222f3256f731c0008bd6c933f706df3209bb286fbc972e52f72c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 11088 bytes

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