Malicious PDF — malware analysis report

Static analysis result for SHA-256 b247e9731772f3dc…

MALICIOUS

PDF

74.9 KB Created: 2021-09-24 14:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0018b4f51912b7629cf9ed206605e919 SHA-1: 3416bbdd145b222bb84bea46094bee5836f2ba72 SHA-256: b247e9731772f3dcd7ce641ff7eaf9541ad6461599630a927c1aedbabee5d95c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that redirect to external sites, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a tactic of using multiple disposable domains to host links, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://queure.ru/uplcv?utm_term=apk+download+gta+v+for+android PDF link annotation
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/8114503341.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/jefejuxoviwobag.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/75028965449.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/jolagawopuzifexane.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/sezutupeboremapojumerogop.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/rifiwuruxanom.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/tujasogowupoxugedivuneke.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/53859118077.pdfIn PDF document text
    • http://teakdeck.pl/files/file/fefofubuwekusabugotu.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/vepurokamerebixokujo.pdfIn PDF document text
    • http://honghuibio.com/d/files/86855281245.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5913fe71a4aa750abc9ba553a6bce3c7/nevegumolejagosowasovitum.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/71375145486.pdfIn PDF document text
    • https://viettrungson.com/media/Files/45734125821.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/15398877507.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/7870964298.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/85842458489.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/39340235641.pdfIn PDF document text
    • http://llux.vn/uploads/files/giwopaxivelivafanaruv.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326a9bd288b---52948959913.pdfIn PDF document text
    • http://3asoft.vn/img/files/71358934466.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/30820785122.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://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_off0000bed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED0 19848 bytes
SHA-256: 7c2433f61c3a0a1bd39b99bd6315881dda03609de8b5c040b3609d67778deaf7
font_01_sfnt_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 10596 bytes
SHA-256: a47641fb267a34878a92232e20573e4d1e583b0e963c0ab6aa04345c8a3fd09d
font_02_sfnt_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1