Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b0e7d1c02c0a4a…

MALICIOUS

PDF

76.9 KB Created: 2021-09-22 14:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77ec54a5d3e7038517bdf6f8ed556e92 SHA-1: 6e89d7301a90162e060fb7ea461ae9d2d96a6446 SHA-256: e8b0e7d1c02c0a4af5ccf5f387879223ff8cd14910d2e719bd37e4348773a8fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hoangle.vn/uploads/userfiles/file/wififa.pdf In PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/23165083905.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///guseruligikaferomafu.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3b765nfb3orrhhovh0k4nopuff/pomuxililobolisu.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/bafolilovimemujo.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/40953722978.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/45594140166.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/wavalalejikabepurugu.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/31352932302.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/rerebesoritewolal.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/40652646308.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/93380023511.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/wagumesepazom.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/32395621040.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2ffa6437f---98532012970.pdfIn PDF document text
    • http://xhslsh.gdx.cn/ckfinder/userfiles/files/xadedavewavoxotuj.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/tijowobevolekojagar.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/24338467272.pdfIn PDF document text
    • https://karthikaspices.com/uploads/file/29253690428.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/68913887288.pdfIn PDF document text
    • http://poliinc.com/upload/files/49947006788.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/36631127982.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/xekedawas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=types+of+research+approaches+pdfPDF 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_off0000c90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 10456 bytes
SHA-256: 4fa5c77794f3692ce691d882ac31a0389cddcd975619a39dc018bb991857cd70
font_01_sfnt_off0000e0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F4 17636 bytes
SHA-256: ad56f16d5b599eb931c46e3242236d010bbad70f9cfc32821321f7b11b06f7d1
font_02_sfnt_off00010dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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