Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ec9f40107a3240…

MALICIOUS

PDF

77.6 KB Created: 2021-09-12 08:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c2e7a4083323571241a1646a9c51727d SHA-1: 0df510ffce73ad630b70fea98bcddc47dd2a5a19 SHA-256: b5ec9f40107a324025865804adc1812e0770aa946043a37a9ba370518159729d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm hosted on disposable domains. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6135

Heuristics 4

  • 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
  • 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://dermalab.pl/userfiles/file/26497018454.pdf In PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/65952379242.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a6924e92---27211258562.pdfIn PDF document text
    • https://ever-progress.com/upload/files/33437765826.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/wivigigenoxugumizasim.pdfIn PDF document text
    • https://bselink.com/userfiles/file/94090225674.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/30337840996.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/81491448695.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/potimiwu.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/laxevub.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/94253928935.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/28430327482.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/vakokigoreniwusixirov.pdfIn PDF document text
    • https://camelcarpet.org/d/files/45420525032.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/62135750498.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/sinokonovabakapemaz.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/75900828826.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/bedijemo.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/sevazo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa548ba7f---pudinitazuwosar.pdfIn PDF document text
    • http://njxinbell.com/upload/files/wumutopupilulasazelenov.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/127228669.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/dekovibareboni.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/99587751513.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/81354617641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=positive+adjectives+that+begin+with+the+letter+aPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 16764 bytes
SHA-256: 95574a69d3b70f28cbdcd994d1b4ae8a931c59b74a88393f0075607029f5ef90
font_01_sfnt_off00011e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E80 11072 bytes
SHA-256: 8a3d4707bd25d478de537e7f392a75f133c1dc9c68e0df37a34331324f60d92d

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