Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf07a3c8f8d04fd…

MALICIOUS

PDF

85.9 KB Created: 2021-09-11 17:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7128aff1c33630ed6d93a09855213031 SHA-1: 62657c1dad14e8d2267d649247741d3ea4d323be SHA-256: 6cf07a3c8f8d04fd9ad058485d59f1fdc0cffbf665633bda64784fb4d068f81d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific intent beyond the presence of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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 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://smidgel.ru/uplcv?utm_term=mods+on+minecraft+mobile PDF link annotation
    • https://eatorhours.org/e-bussiness/fckimages/file/63493220399.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/munasisokegalerow.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/zazozuxotenupamujixaxeko.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/80610598828.pdfIn PDF document text
    • https://novsport.com/content/File/xegem.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/mopokaxagajilonukoteke.pdfIn PDF document text
    • https://superchills.com/userfiles/file/beselosimitimip.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/vegak.pdfIn PDF document text
    • http://hkalc.com/userfiles/nekisupag.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/62412317751.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///fexozinobagix.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613abbf5bf729---19694911197.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/10232231478.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/86214116272.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/dufatixisa.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/sidutenizife.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/97511264345.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/73199373920.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091012301473499.pdfIn PDF document text
    • http://nemalipics.com/tepaxitidotemosu.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/futazovakolipovoguw.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d067f05de---lorete.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/kosobaladaladi.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/30111379455.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://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_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 17688 bytes
SHA-256: e89e6967593a3d107b118688145e98be061bbb75c4feb77d51dc39ed6022e172
font_01_sfnt_off00011914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001312b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312B 10768 bytes
SHA-256: fb080377b0fcda16c79e9636b02fdab4cdd593e9bfd0314b10b049af76c46c6d

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