Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c81add992b2f7d8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 16:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 86eae110817803a343a323a96eb09b1b SHA-1: 25f138f04e82d353aecc7fbf522ffd50e43918f3 SHA-256: 8c81add992b2f7d84cbf07b653ea299297373adfc890d396b4b5c53a7f76989b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs pointing to disposable hosting, identified as a link farm, strongly suggests a phishing or malware distribution attempt. Although no scripts were extracted, the PDF structure and URI patterns are indicative of malicious intent, likely to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=saga+de+garlic+jr PDF link annotation
    • http://detskaoptika.cz/ckfinder/userfiles/files/13068219052.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/rolat.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/merifugomotijisogizopet.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/wapirazegekoxozaginotu.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/vibujawafutikimi.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/jusosigubet.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/newevulede.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/pakuromoganelajuzadem.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de7e5a3caf---41115874091.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/93496210015.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/nilaza.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/55618481405.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/sevotuvutisuju.pdfIn PDF document text
    • http://kaies.net/upfiles/file/befudupulude.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/vixulerusukegiwa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130194c29cfb---18674696896.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/jodab.pdfIn PDF document text
    • http://domosplast.hu/files/file/37967679857.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/91064567275.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/55728294900.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/gulabufamonipaza.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/15246895178.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_off0000dbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFA 19680 bytes
SHA-256: c53f6e7bedbb1a8c5c01bbf7323eb2b4383d8789cc3f759a0d5e32a87e8913de
font_01_sfnt_off00010ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF9 10260 bytes
SHA-256: d3a0dcde24e15cb288fc2a16c718a19160a328943d0d96adf817515e2ffc2edd
font_02_sfnt_off000125da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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