Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbd603e4fd7c002…

MALICIOUS

PDF

88.2 KB Created: 2021-02-11 21:06:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 60b3ec2768d18fe835bd4e6e829ee80c SHA-1: 7a649654ff7afe69c8de00deb17bbf812b6061ad SHA-256: bfbd603e4fd7c002afe664b46077cb3b95e46dda7c07d57406d94a406e845375
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, indicating it is part of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or phishing pages. The document body's mention of 'lifeline exercises for seniors' is a common lure to disguise the malicious nature of the links.

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://maypoin.ru/123?utm_term=lifeline+exercises+for+seniors PDF link annotation
    • https://xovipapapili.weebly.com/uploads/1/3/0/8/130873893/f19eea.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/efhbieY/aerox_3_wireless_release_date.pdfIn PDF document text
    • https://belogukuke.weebly.com/uploads/1/3/1/6/131637095/leninavowiwelebo.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/Zptjegj/tubemate_apk_uptodown_2019.pdfIn PDF document text
    • http://copyrighthelpptteam.com/xidunazawagegubopofinuzrz4h.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/geGibFs/41883591776.pdfIn PDF document text
    • http://supportcopyright.net/mad_battle_royale_apk5epp2.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/ejiEyhi/jatizusajosolibu.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/6igPibw/2708045326.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/5aELy5F/32548081111.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/joxeveveromagekilopon6bmau.pdfIn PDF document text
    • https://cdn.sqhk.co/porodiwaten/ZBHg6jh/mawurafulanuwejuze.pdfIn PDF document text
    • https://cdn.sqhk.co/balatexoriv/jjKmHYC/picture_frames_unlimited_tallahassee.pdfIn PDF document text
    • https://nufujemirifo.weebly.com/uploads/1/3/4/8/134868255/pejonufiwa_salezilodowag_ganaferat_fizivejik.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/qhihiMY/nuregivajirifavut.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/bH0BoW3/35627205730.pdfIn PDF document text
    • http://everydays.space/microsoft_advertising_jobsatinu.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/dazifozixawus/96946366138.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/sewusakugevag.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/lopevixazod.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_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 4676 bytes
SHA-256: 0416df853cff5756ed8d5f425d6f2db1b1db9ce47f32fa0dd5c23b7ed8c5d018
font_01_sfnt_off000118f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F6 10832 bytes
SHA-256: eb7478059e30ed9427786ce671a58a9f1c1b3e9d265dbdba0473863ea47b3bd9
font_02_sfnt_off00013e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E36 16060 bytes
SHA-256: 1143ecdd1036854af7781a9416d0a82fe6fe24e09269eea81b933035be45ec4a

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