Malicious PDF — malware analysis report

Static analysis result for SHA-256 912f65566ee3378b…

MALICIOUS

PDF

85.6 KB Created: 2021-09-24 04:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 324d5400430139d7eeec9ee6bb81f445 SHA-1: d5d2e3c1a7423e302ca72313f1d79d5e19d4ddd4 SHA-256: 912f65566ee3378b3217ed0f8e23a46482bab65945dd951b533774b530f6a563
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are structured as link farms pointing to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute further malware or phishing content. The ML classifier and ClamAV detection further confirm the malicious nature of the file, indicating it's likely a phishing or trojan distribution vector.

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://coretry.ru/uplcv?utm_term=call+of+duty+2019+pc+torrent PDF link annotation
    • http://studiolegalezullo.eu/userfiles/files/repewekij.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/41196033207.pdfIn PDF document text
    • http://zgic.ru/!upload/files/10956578467.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/81419785063.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/49746517391.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce7c1a324b---14992564865.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/gigazomugopigorozi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0373bdab4---tituzaxisofamejewi.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/bavimoniluzoguvosus.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/xokagu.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/rowipopajevibajepoxe.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/karopewopezuwoki.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/4984286244.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/sosaguf.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/47414159595.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/bofipapezuxew.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/tolulu.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/73216820656.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/82169953214.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/kavurib.pdfIn PDF document text
    • http://szwygs.com/upload/47224224639.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/74605957317.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/dogunakepuzomuwuno.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/wutabejolitev.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_off0000e672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 18728 bytes
SHA-256: ff00e7b1c4ef7cbfc6730b0803e0728aa6b4689d026cdaa68bf6f68e2de902d9
font_01_sfnt_off000116c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C6 11060 bytes
SHA-256: 34a1efd0f1d0a9570ffaa40cd4d9d9e027eb74dededc68e11db4d1ac6da1691a
font_02_sfnt_off000130d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1