Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c55001d1266a9c0…

MALICIOUS

PDF

73.2 KB Created: 2021-09-13 14:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9cbef43983f33a864a23136fef6b3807 SHA-1: a8f46b8039668aa397384b66c4a80aafb6303408 SHA-256: 9c55001d1266a9c002e0cab4cdcbf067c02fb16bfce5723b6e2ccd3b1a540dc6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or scam lure. The heuristic 'SE_CALLBACK_LURE' further supports a callback phishing or tech-support scam pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=ff+exvius+guide PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137861527d66---2175176905.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/retonaru.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/gutowalemimezuxonuziju.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/kevimowi.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/71645095011.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/30244462452.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/lixoxibutezomiwemitapi.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/fedonopipifogapidine.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-9/20210909044421781664.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/41079507505.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/natik.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/27065797612.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/41340317549.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/28144157238.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210908_6921708743A86DF4.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/vozevemulajibajidisasoma.pdfIn PDF document text
    • http://4yoga.by/pics/files/38252284903.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/154580aa8bf1ee55b54fa21b4c5c7d30/bilakakegipifinorufumawa.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210904012258_1786606020.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/vexadasijoxuwam.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/71917787211.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/nixege.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_off0000bf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF68 15992 bytes
SHA-256: 086da320727ef324087909df3fca2a006a74a83e8e9e4e1df079965cb31d7b89
font_01_sfnt_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 10144 bytes
SHA-256: 632786246a52d34285950a3e36507655e517895cd4541278948c2089235fd2ee
font_02_sfnt_off0000ff51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1