Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafa6c6f11529dae…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 03:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f20a9d096cfd5a56e52a14e095b017b SHA-1: 4b90ab65589fa52b40246441989c7fd3ba172951 SHA-256: bafa6c6f11529dae8b273c7720734c493dc4928864355f6f33e87baf7ac41131
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to distribute malicious content or conduct phishing attacks. The presence of external URIs and the link farm heuristic indicate a deliberate attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://nomylo.ru/uplcv?utm_term=ar+flight+simulator+apk PDF link annotation
    • https://digireg.com/upload/milulazebi.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/359bbe97cf082bab5883ad8d10cc3f8d/mukubupiteguvusekoxiw.pdfIn PDF document text
    • https://eurotig.ro/file/xetujagapilojudukapixoko.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/rojejatozuje.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612f462197956---wisozarowotabadinakozag.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/33276108380.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/waloranejitu.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/80987048579.pdfIn PDF document text
    • http://szhlfz.net/upload/63994435160.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/50631734572.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/nenazubil.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/48415449247.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/woguzojuxikuwewadej.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///84524003821.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/8234980028.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/29421668300.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/kalovizugurabofev.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210924_063602.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/gumizavonalovepegelujiz.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wemugitomata.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/mijakofob.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109290503229029.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/xotokozabofolowuwabinuped.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/ruvulurenole.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/62926837759.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/xinobamapivosinedutidufak.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/ladeturosipab.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_off0000b2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CF 10740 bytes
SHA-256: 781e320b866f901730a0e54d9f789e0147d2fc16a9d39cb15e5733354868ba37
font_01_sfnt_off0000cb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7D 14576 bytes
SHA-256: 083d21e0b8f9e3398263d2abe7d5dbde07c8a4411d7cb82d76ce616f6c8ad81d
font_02_sfnt_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1