Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38a2e5dc4b2fdad…

MALICIOUS

PDF

77.8 KB Created: 2021-03-21 23:23:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05bdcec443cee51ad3240bd1d45fd06d SHA-1: 13a552bc0938f3c1bae0d6e8b5789e5faa7a7a5e SHA-256: d38a2e5dc4b2fdad3e359fae2d5df3f55bc0bd462581106a669b862815c46d67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one pointing to 'kuzutuzo.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to a book title, consistent with social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wix?keyword=statistics+for+six+sigma+made+easy+revised+and+expanded+second+edition+pdf
    • http://bluhgang.best/2248566082823jcr.pdf
    • https://zifusiwi.weebly.com/uploads/1/3/4/6/134686012/nidekil.pdf
    • http://posadukik.getenjoyment.net/pokowagajikebuxinaxabufo.pdf
    • https://domaruvujus.weebly.com/uploads/1/3/2/6/132683142/lovepu.pdf
    • https://cdn-cms.f-static.net/uploads/4416506/normal_600beec252303.pdf
    • http://jobs-ingenieur.best/48326180621bjzsw.pdf
    • https://jakilirimilibev.weebly.com/uploads/1/3/4/8/134862861/8f91f0bea57f0e1.pdf
    • https://felinabaf.weebly.com/uploads/1/3/4/3/134380667/nabepa.pdf
    • https://static.s123-cdn-static.com/uploads/4466376/normal_5ffcc9c2d5d2f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://janevowox.epizy.com/wolirorudavejesukutam.pdf
    • https://uploads.strikinglycdn.com/files/ca355445-b43a-405d-9f63-e21991412658/35967921702.pdf
    • https://uploads.strikinglycdn.com/files/1a34f241-7c22-49f3-9640-05fca0dd07d6/what_are_good_active_listening_skills.pdf
    • http://wulibazosuxib.onlinewebshop.net/el_caliban_y_la_bruja.pdf
    • https://uploads.strikinglycdn.com/files/0a8dadb2-b4e9-40a0-81b5-232c219722f2/453335543.pdf
    • http://muzulozak.atwebpages.com/94868391379.pdf
    • http://timaroxakex.epizy.com/atrial_fibrillation_guideline_2019.pdf
    • http://wivaxodi.onlinewebshop.net/juwudalalimumexadadaporax.pdf
    • http://vedumojaje.epizy.com/mit_app_inventor_2.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2be.bin
58c3284e061edb95d10794cd2d6eb1a6c3404a4afe2ced8136a46fa7d0ef4a9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 5776 bytes
font_01_sfnt_off0000f65f.bin
149738eb3e1d0bfb4a5732e89a115965e6f0cf3fc4971c694d3ce3619176544d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 6148 bytes
font_02_sfnt_off0001063e.bin
af5895f431131c6a0cda1fb4567131bb27216cfa15fcab1ab35a8321423a457c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1063E 10124 bytes

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