Malicious PDF — malware analysis report

Static analysis result for SHA-256 74aa5b7a549164ec…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 06:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fd62866519d7ff95e387b52b2b2a86cb SHA-1: ba1b4d657d05540a7f017f5c66aa7873e6a777bb SHA-256: 74aa5b7a549164ecfd2031edc2ac79a2378f9aaab4bedd4cba1175e655c918ab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the link farm heuristic point towards the document's primary function being to redirect users to malicious sites, likely to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=android+1+bike+mayhem PDF link annotation
    • http://sartoriaventurini.com/userfiles/files/zinujazurov.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/53033900822.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/xetefapojeg.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/25733983203.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/xidafupub.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/lexebezemipab.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/positele.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/34047796521.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/69798770681.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/40151192341.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/jopapevakapavi.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/xofefedax.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/32650067728.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/obg9rsk0dbqdslv82lf3je9iq9/77555390668.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/tusijijugos.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210903134603.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/bizukofimomixiserogaxa.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613785e34f724---83337806570.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/93343692915.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/22960171821.pdfIn PDF document text
    • http://keramann.ru/uploads/files/sejeniwisijorufu.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/tanurisevasogezubufedixo.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/22406556474.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_off0000d138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD138 21476 bytes
SHA-256: 36997cbc07f05e1594af8fed2f3a37828603780594565a21b641c797da726e7e
font_01_sfnt_off000109df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F6 10580 bytes
SHA-256: 2b84608b3902f58975892709f0cde04ce65e7621e942b3e01a8f90c38533f171