Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91f5d8f402953e9…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 10:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 34f3b88562317e9c1e295539304dbf1f SHA-1: b2145b57ae6b53afa2bbec215f0fe115b98eae1f SHA-256: d91f5d8f402953e9234ae8594866cea66720fdb632f30896205aed7d336b78f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm with numerous external URLs, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://ketchas.ru/uplcv?utm_term=trigonometric+functions+chart PDF link annotation
    • http://adria-ex.com/images/blog/file/51262669959.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/43813487541.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/40060837366.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/3374425840.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/mumabomepevezulopesan.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/vodumeg.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/92795634054.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/20923507184.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/470756355.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16150112435595---72857413848.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3f081e686---zomawujibulamisokasadiv.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/wakinepitepuzafatunesozi.pdfIn PDF document text
    • https://cecprint.com/images/file/63896715839.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/gejuxugujedafimefubilireg.pdfIn PDF document text
    • http://soles2walk.com/data/file/simivomabamekefifekafe.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/momibadejolezegigow.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/sunogebewogelud.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/71496392863.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/dutulikokutavilugasa.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/6823203714.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_off0000ac6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47E 17072 bytes
SHA-256: fd69988c5fd5bcb3e1cc97298de90546de57bdd6b3cea0a6827b6c65baaa572c
font_02_sfnt_off0000f04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 10800 bytes
SHA-256: 7c5b0204b1a0c4a3ca10763109776e1e270aae89022f814d722f104c534fc665

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