Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f114a70dac13ee…

MALICIOUS

PDF

91.5 KB Created: 2021-09-20 22:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 021e07925afd5d3b9802f1013df4ba23 SHA-1: f931fe0c8bb85b38a74c18a28f514b9ab7fe42ec SHA-256: a6f114a70dac13ee021930a44ac03437f5e52edc753174bf17fba3b8108033d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it is designed to redirect users to potentially harmful websites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://laduses.nl/image/file/pisixokofokuwagoniza.pdf In PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/guzobosudib.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/95177749835.pdfIn PDF document text
    • https://soechi.com/userfiles/file/ponis.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/3279036272.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/rosoribovopaxidomeveve.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/bofugadiforu.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/bedofuwe.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/xonovovadekedam.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/70285023871.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/zafisanujulomokolo.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210901_073109.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e21244df7---95004709475.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/2025778451.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/jejurumuzezoxeba.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/patoz.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/68407209578.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/56724015848.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/78987952156.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/53663456890.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/65970614169.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/71266041554.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/62139542695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dnd+5e+pdf+character+sheetPDF 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_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11702 10592 bytes
SHA-256: ea1523b378e88fe1998aa218c7d31a2b5ee6edf1a6eb29f7b1b16556993f71bf
font_02_sfnt_off00012f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 18968 bytes
SHA-256: 552482e0182104568ab87bf0419c93f922269a32ae63002038b1c5753ea7cb95