Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e46a755f588f730…

MALICIOUS

PDF

109.7 KB Created: 2021-05-10 16:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f76660bfe7c249bea15e559ebcb9737a SHA-1: d3ca9919fffaacbe49c646c83dcbd8abefd32eeb SHA-256: 3e46a755f588f73089c5fff0a98d0f233c2c4f6f3914d0bb8390c54ff7e45950
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external links to other PDFs hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the PDF structure suggest an attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=pillow+thoughts+2+quotes PDF link annotation
    • https://gobebirerelimi.weebly.com/uploads/1/3/4/6/134651667/f5110e.pdfIn PDF document text
    • https://pedagojewixa.weebly.com/uploads/1/3/1/3/131398360/metutolup-sesadumudoruvi-gosesujoditebar.pdfIn PDF document text
    • https://mizemajawoxulu.weebly.com/uploads/1/3/1/4/131437858/jejumifidejumekowiwo.pdfIn PDF document text
    • https://tulaliferejuza.weebly.com/uploads/1/3/0/7/130775137/1168178.pdfIn PDF document text
    • https://gevotasi.weebly.com/uploads/1/3/4/3/134389209/duwumejolitivexuzaga.pdfIn PDF document text
    • https://nupowanekajotut.weebly.com/uploads/1/3/0/8/130815303/guzesozimanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464315/normal_6050fb89dd57c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495050/normal_5ffb9f60ebb70.pdfIn PDF document text
    • https://lolutisoxat.weebly.com/uploads/1/3/4/3/134315909/nuxoduwetux-vokof-gukoxogaba-ralupepetejajep.pdfIn PDF document text
    • https://migapivali.weebly.com/uploads/1/3/1/3/131381101/nutaga-xuxit-nuvapofun.pdfIn PDF document text
    • http://bioforce-co.site/97185307836rg5yn.pdfIn PDF document text
    • http://smartroom.pro/33854309970nsho1.pdfIn PDF document text
    • https://zorazuzibenad.weebly.com/uploads/1/3/4/6/134617736/e04605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_605827e582586.pdfIn PDF document text
    • https://zuwufapiju.weebly.com/uploads/1/3/5/3/135348861/9f800375855f9a5.pdfIn PDF document text
    • http://inmyshtangen.xyz/nikofefoz2a26u.pdfIn PDF document text
    • http://bojikewexojok.iblogger.org/how_long_to_get_stimulus_check_by_mail.pdfIn PDF document text
    • https://kavosimodo.weebly.com/uploads/1/3/4/9/134901779/lirobosobozasitilufo.pdfIn PDF document text
    • https://dofigova.weebly.com/uploads/1/3/0/8/130813881/mekobutifo-penurakig-zirozafusadut-pewixukon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_6048a715b95e7.pdfIn PDF document text
    • https://javogukurajukip.weebly.com/uploads/1/3/4/2/134235542/dd6ae398d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wabalan.epizy.com/tumigisomilegiwujakev.pdfIn PDF document text
    • http://rinubokuj.rf.gd/how_much_does_it_cost_to_repair_a_dyson_vacuum.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD4 4316 bytes
SHA-256: ae2567730fc041e85e061a109267363f8b3fcac018f8145dcd792a0fe8cf73d1
font_01_sfnt_off000159ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159EC 4992 bytes
SHA-256: 86a122629c51dc0e0f972287a9d65872e5de758b64cac16cfe8566b3e1a1c486
font_02_sfnt_off00016b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B05 10992 bytes
SHA-256: dbd74e99960d181fb5f607aa13b7dfec200a2a6b74ed6eaa6942917450f71deb
font_03_sfnt_off00019084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19084 17024 bytes
SHA-256: f3a1c12a85946c7b8eed0194292f455ee812cf334116dfe6deae0fe3f13def91

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