Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc06f8e67d0eed1…

MALICIOUS

PDF

77.6 KB Created: 2021-09-12 06:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71405d283ec0d723b18dffe79e9dcc4f SHA-1: 46e5324a745ac00642425f17c03d0a1805998942 SHA-256: 3fc06f8e67d0eed1a3ae8397c868d4ad6425585af9dd685e6214a8a7dffba8e1
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm designed to obscure the final destination. The primary purpose seems to be directing users to potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sitarasign.ir/data/file/fiduboripiruku.pdf In PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/rinelubukowa.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/27346802869.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613914af5fa90---67391504563.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/wepipo.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/sinig.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/3545870684.pdfIn PDF document text
    • http://ccadl.com/files/20210907113148.pdfIn PDF document text
    • http://awards.nl/img/cms/file/vafifarefegudin.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/53095161274.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/gosarowikixitexedutano.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/gajosujipavixoselitikug.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/30217329345.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zogabeputimikeresizamak.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/nadumeguvebiwiweriw.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/26814845298.pdfIn PDF document text
    • http://babamoleskine.com/files/file/bunavegisudekukip.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/buzubulalidozifup.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/disusubezed.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/gimomirotovowix.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/dazej.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/rakigegu.pdfIn PDF document text
    • http://rcmo.ru/upload/files/5076721144.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/baxubunugazabizetafeva.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/xofabetagabivosuved.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=nobel+led+32+inch+price+in+pakistan+2020PDF 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_off0000c7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FF 17764 bytes
SHA-256: 3be2095ae8a0144cede7b076cfb4ab504c789227021afe65664abf6e1e806759
font_01_sfnt_off0000f64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 11232 bytes
SHA-256: 305062cc0df09b389821bf7b0a551d566da7a6104e4d673232bd02b13c2bb23a
font_02_sfnt_off0001106b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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