Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc9a704aeb1a920…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 19:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1797f2b7277cf4b7aaa194b857bbd11 SHA-1: 96d0d6dafb84ea26d769b8a34b7120b78a43ce43 SHA-256: 6cc9a704aeb1a9204a7878eadc30c14c84dcebc52c88eb78d49b1996faf45522
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs pointing to potentially malicious domains. Although no scripts were explicitly extracted, the nature of the link farm and the ML detection suggest an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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 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 http://studiotecnicolamanna.com/userfiles/files/fenuvoba.pdf In PDF document text
    • https://seedomoretravel.com/files/files/gobunirifaf.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/46953114080.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/80496831356.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/47934055530.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/74257176242.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22e896ae2c75e3b6454f40882cf3a252/47362133043.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/27697350373.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/90239552314.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/4435363650.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/97412540132.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/vubamamatozet.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/32127036267.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/raxunipisuga.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/tagijupopufeso.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/42115849014.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/nonuwekakodunadag.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/wideviwinijurumesobi.pdfIn PDF document text
    • http://chongros.com/userData/board/file/50813795849.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/tabibegumet.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/zugumebavafevofijagewavev.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134d4797a86f---59876514732.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/89953669686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=biggest+landmass+countriesPDF link annotation
    • 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_off0000e0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 10864 bytes
SHA-256: 3a30147cc7889d37e3991de5265c8ef7ff89d75623d0847eb72df690209d41e8
font_02_sfnt_off000111ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AB 17872 bytes
SHA-256: d7951b07e8315e3896b4e384f0fc52173ffdeb2997f577609adc3cfbdea7c913