Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7a259c9d73d4bc…

MALICIOUS

PDF

92.9 KB Created: 2021-09-14 12:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: afc0b4702e4ddffab619050b8b80b80a SHA-1: a539b7ae32d97355d14659f171e4e5b2941c5393 SHA-256: 5c7a259c9d73d4bcbe0da9b7cb914f43cc602ab9fbb987e6e53acceb8f3483ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojanized document. It contains numerous embedded links, many of which point to PDF files on potentially disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights this behavior, indicating a high likelihood of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://namlinhchisapa.com/userfiles/image/file/xujujixijojegegujujikew.pdf In PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210909060958.pdfIn PDF document text
    • https://zzhqhi.com/d/files/34010034960.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210901_8B5409A74ECFFAB9.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/jawibovixiwev.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/55421710771.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/zatabimavuxetufobepaw.pdfIn PDF document text
    • http://www.heksan.com.pl/file/6488118446.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f15bde44ce---1605574351.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/goxuvutowetej.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/jadidinafitejuxozo.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/kadubenodi.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/faxatuvirudefenipitigavi.pdfIn PDF document text
    • https://wineart.online/userfiles/file/57583891993.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/83933179377.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/48507863602.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/2926094625.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0d245002b0e471e9718cf09e2971ebb4/4267044125.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/18579139570.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/fodawuzekuwasaf.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/93488067741.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/rivevamurofelabokinijitex.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/28131870379.pdfIn PDF document text
    • https://actorconseil.com/files/file/70017574154.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/8851301696.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/41149749991.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/31237671518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=walking+dead+season+11+episode+23PDF link annotation
    • 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_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 18900 bytes
SHA-256: a4ce37b79f41ec2b8f8773b94afdf25bb08b54edea821b3dda03bab8164c2979
font_01_sfnt_off0001346f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346F 10796 bytes
SHA-256: 7cce04924187a6d8ef0ead4195f60e704e9b4505f19a18d52aaf3e51062a0e84
font_02_sfnt_off00014d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1