Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fb473888c9f951…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 22:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 713697f6b53c83bd2eb3429127f8242d SHA-1: 545e2b1560b0f376206b25ae107961662258457f SHA-256: f5fb473888c9f951d7c5c8888ec6017f85710bf7a2892621610309eae9237c78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external URIs, including one pointing to 'crewmak.ru' with a 'vlc android tv' UTM term, suggesting a lure for potentially malicious content or phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports a malicious intent by identifying a link farm on disposable hosting, indicating an effort to obscure the true destination or spread malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=vlc+android+tv PDF link annotation
    • https://ctsgroups.asia/images/file/siwadojolejeronidep.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/kosuru.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/45931168671.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/20c7cf9d5d63405af9c07690cf504063/kotegopa.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/11810818318.pdfIn PDF document text
    • http://btfa.tw/upload/files/39232414596.pdfIn PDF document text
    • http://talesma.com/E/file/67085903108.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/14140424274.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/guviregigazewuxumo.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/86628472733.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/tojokipofexiramilezomef.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/18948999275.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/lakurusipitutege.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/ziwiporulenebaj.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/9683003701.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/89401051889.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/bajegapozinu.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/35723174480.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/58700340455.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/31238413575.pdfIn PDF document text
    • http://congtyvima.com/images/Download/sogatavepozomox.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/jenalutowafazaxolal.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/13333952342.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/turirujejonuj.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/92684462956.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_off0000d3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C7 22952 bytes
SHA-256: a4a876ffe1afb73932cce09ffe7fb7d2efaae354b4b7d1cad3b61f674a0a5773
font_01_sfnt_off00010e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12686 10096 bytes
SHA-256: 51d7879cf27178d39868d1272c6baefdf2b3a816b14cf8ecb08a9c8d05e673e3

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