Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71049e6aa7717a8…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 09:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51c40e0b832411f52c963d6afa841709 SHA-1: 4db801e4fa744a153788b304ad57ae4daa771da2 SHA-256: c71049e6aa7717a83b0cacd9ea207ddeba8c5aecdf26f19a689e156dabe091d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that has been flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute or phish via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://garglob.ru/uplcv?utm_term=there+is+no+game+wrong+dimension+android+free+download PDF link annotation
    • http://kripasec.com/userfiles/file/tamejetajapebalosa.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/kesabokosavibig.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/42120731311.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/viboba.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/welagijune.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/17265793221.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/37379841221.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/63885312982.pdfIn PDF document text
    • https://senegal4d.com/contents/files/33916627098.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/xoxosenas.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/35757121647.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/xabegotujen.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/65878336277.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/62271236673.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/zekukop.pdfIn PDF document text
    • https://motoralbini.it/files/file/romewiwufoxujenokeguze.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/fiwelebaveferawegeb.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/lavop.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/kewesusojuwikekavelor.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/42469019719.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161301bdced974---dagopuzezipujesone.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/7002308676.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/madetubutajuba.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_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 17400 bytes
SHA-256: 425a4b2e88ed7e4ef72dc76aa5924e5f9b41bcc284e5e1884ea441a09d02fbd8
font_01_sfnt_off00010175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001198c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198C 10752 bytes
SHA-256: 4777bbab2e807e3065187244693c431d075c5222a9af966eeb9f2438942314d9

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