Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfc677ba5d7a2b0…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 15:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e92416130b1ff6b9aec8dc0f21dbfd7b SHA-1: 387d49f590a9d312ab187edfa5e3be8ff146b988 SHA-256: 3bfc677ba5d7a2b0dfd4d3b5afcf2436d0f376dadd55e48cad5d724eaa398a68
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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=root+moto+e+without+pc PDF link annotation
    • http://www.hgbehringer.de/img/files/files/povowaxavijagisuwadigika.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/vavekeriletavuke.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/80592893598.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/91745824013.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/93424165655.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/rewidokagaxewaxabumup.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/difozodejifufapupixe.pdfIn PDF document text
    • https://pmms-online.com/assets/file/25869468295.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130a98dc6a54---larerunuva.pdfIn PDF document text
    • http://packamate.com/userfiles/98194209648.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/10678378220.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/musapaxubepazivujutujije.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/46787101442.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021911728132769.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/18444651768.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/kevonotomopawosam.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/nebalolizefovuwulipiles.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/2654647654.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/89898691727.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/mofijobufasux.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090208191583.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/43303500523.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/xifisanepokovu.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/nipezinofirijujafugojevi.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_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 17800 bytes
SHA-256: 23138c58d8ad38ffe8bea4c6502bc161c8f17074a02b3a8015342ce66eacc366
font_01_sfnt_off0001112c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112C 10288 bytes
SHA-256: ea93fe36a282e16060422f4728c19a0abf558a72d174df18106bca0564128d79
font_02_sfnt_off00012870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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