Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fb081902b4b81c…

MALICIOUS

PDF

85.9 KB Created: 2021-03-28 16:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 944267caa9fd34ac274279655af8f45e SHA-1: 529295fc3349ee825d7aa5a85c2248fe4e867c94 SHA-256: c1fb081902b4b81c53747b69ea2c1d9c3bafda5c348137de7ae3f831f0759604
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to programming and a specific keypad, which is likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=how+to+program+mighty+mule+keypad+mmk200 PDF link annotation
    • https://xatawelakobij.weebly.com/uploads/1/3/4/6/134685719/zumibode-vawobi-zikirixelijex-guvamopefite.pdfIn PDF document text
    • https://zevakevo.weebly.com/uploads/1/3/5/4/135400716/zoveno-takowamobu-wawem-xenajeveg.pdfIn PDF document text
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/nuzesomaso_xevibekodinis_jelisijozo.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/7b4644d8.pdfIn PDF document text
    • https://sonelalakilo.weebly.com/uploads/1/3/4/4/134400406/muvifetogisemosepoz.pdfIn PDF document text
    • https://zobojosapez.weebly.com/uploads/1/3/1/4/131483592/mejufeludar_duxaxirir_boluvuzibakik_zopalagexabaj.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/VkBADGK/lisoluvawofamigeluxal.pdfIn PDF document text
    • http://pijitirade.iblogger.org/gikirozulematubelotufov.pdfIn PDF document text
    • https://loneluripovulom.weebly.com/uploads/1/3/4/3/134364014/2e5cf04be2c0.pdfIn PDF document text
    • https://cdn.sqhk.co/bipufawawi/d9ghghv/nunojipobigaxubo.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/Iukij2z/the_hangover_3_song.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/bifenizujus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muxegeza/71944347578.pdfIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_273ec4382e3148718c7a07b4a6819e53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/launch_jeff_walker_espaol.pdfIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_19c4881e994d4589b78181785cbbc5c2.pdf?index=trueIn PDF document text
    • http://rozipiliwune.epizy.com/eddystone_packet_format.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_off00010b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5E 5688 bytes
SHA-256: 903c2fd9b04902e1e1c9ea10069033ca4483893acb346eb930f83d7e01b0c2af
font_01_sfnt_off00011ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA7 13292 bytes
SHA-256: aa6e7e11f31dacda0c1799af5541ff8a607fce050248f0ddf61928edfad523b6

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