Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f650c5e164c06ac…

MALICIOUS

PDF

88.9 KB Created: 2021-03-09 12:29:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 820a4adc23c4046018204d3fea7397ae SHA-1: be8b9fd8e35aa97c024bcc155490b541cc0e6517 SHA-256: 6f650c5e164c06ac904ef6b5892af2e495ef500b25bd51bf22c9c18be5d729af
166 Risk Score

Malware Insights

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

This PDF is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains multiple embedded URLs, including one that is invisibly linked and points to a suspicious domain, likely intended to trick users into downloading a malicious file or visiting a phishing page. The PDF's structure and numerous links to disposable hosting further support its use in a phishing campaign.

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://gimoguvi.ru/award?keyword=analytical+mechanics+by+hand+and+finch+pdf+download PDF link annotation
    • https://zefemebok.weebly.com/uploads/1/3/0/7/130775969/kuzojijinez_fupamovirebali_beleg_nabewupim.pdfIn PDF document text
    • https://wotuvinuvokotar.weebly.com/uploads/1/3/5/3/135330473/zepokovof.pdfIn PDF document text
    • http://loginwithfb.site/absorption_costing_income_statements_ignore7aorc.pdfIn PDF document text
    • https://cdn.sqhk.co/perokokamosa/dt4e0WI/36844791128.pdfIn PDF document text
    • http://zoo-taxi.site/bukebapj12j5.pdfIn PDF document text
    • https://mitalukomajamo.weebly.com/uploads/1/3/1/4/131437074/xopagopajigukuwalovo.pdfIn PDF document text
    • http://helpcopyright-service.com/expository_writing_graphic_organizerjxcec.pdfIn PDF document text
    • http://disconto50.info/fl_studio_trial_free_download_for_androidvqbb5.pdfIn PDF document text
    • https://tajuwelaf.weebly.com/uploads/1/3/1/0/131071184/ronimotezo_rorebesatodaz_fegux.pdfIn PDF document text
    • https://xebejadeveroj.weebly.com/uploads/1/3/0/9/130969735/2256635.pdfIn PDF document text
    • http://kernig.online/cisco_sg300-10sfp_10-port_gigabit_managed_sfp_switchct3e5.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/nezolasujivezokornlb31.pdfIn PDF document text
    • http://bitjoms.xyz/89959902642bvxtg.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/how_to_pair_airtel_dth_remote_with_panasonic_tv_remote.pdfIn PDF document text
    • https://cdn.sqhk.co/vizefejij/827jjIS/animal_skin_saddles_rdr2.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/fgdhfvB/93082847023.pdfIn PDF document text
    • http://osmosiotzs.fun/nixorejqxw67.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/c6e50aa9-395e-4e38-ab2d-c85deb7add76/mowisidekokiroxag.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/chemical_engineering_handbook_perry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6bdcb51-bb2c-4a33-a4e9-cb306e52a2c2/35949044682.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 5624 bytes
SHA-256: 2f54582b99a878081faf730ae43fe44fea578bfa54db338a8154eef0253c748c
font_01_sfnt_off000114f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F0 10720 bytes
SHA-256: d0fa1db3d9236c15cdac730d5ec8822a3dc4cd41e078016df1c770f79ab61e3b
font_02_sfnt_off000139ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AD 17988 bytes
SHA-256: 1a99dab139b0b399c9d76949d16f744304054fb371de294f264ab5cd334131e6