Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc1b6b80c2eab48…

MALICIOUS

PDF

83.9 KB Created: 2021-03-08 20:49:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaa2f39b9b495c73a9552ae374fe1c4f SHA-1: 70f4c0538d79d98b0e69d065f292686f2c213e0c SHA-256: cfc1b6b80c2eab4845e97a06a6f13aa41cb03bfab5ffcfa6443a028656b40bd8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://jottigo.ru/123?utm_term=galvanized+steel+sheet+suppliers
    • http://rufoferapavinew.medianewsonline.com/zerigufuvix.pdf
    • http://pebogoginugi.iblogger.org/eclipse_of_the_heart_piano_sheet.pdf
    • http://poxumanavofeboz.scienceontheweb.net/node_js_referenceerror_document_is_not_defined.pdf
    • http://vebilodugisugod.iblogger.org/98275935617.pdf
    • https://cdn.sqhk.co/naxupowu/Gid4M42/puzzle_warriors_facebook.pdf
    • http://rasazevedip.22web.org/preformatted_text_is_displayed_by_the_browser_in_a______font.pdf
    • https://cdn.sqhk.co/posojuvapono/jeicWvZ/37755936919.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wonanikapudidak.atwebpages.com/dijezagunon.pdf
    • http://gimazabovatefik.epizy.com/lilirowe.pdf
    • http://dibulazovila.rf.gd/54173438391.pdf
    • http://sikamavidasatam.epizy.com/77313770435.pdf
    • http://fidazel.epizy.com/60999253767.pdf
    • http://mutidulofof.epizy.com/jasujobepapalab.pdf
    • https://uploads.strikinglycdn.com/files/cc0a26b4-a752-4835-8e63-c86bdab70406/wemizovuzuju.pdf
    • http://sadamenukovizep.epizy.com/how_do_you_do_the_buteyko_breathing_technique.pdf
    • https://uploads.strikinglycdn.com/files/5b70dba6-7d43-40c1-b20e-fbd7820323ca/9812290474.pdf
    • https://s3.amazonaws.com/pokixovuxik/zufidezafanalevelisafagu.pdf
    • https://uploads.strikinglycdn.com/files/81563200-a585-4c8e-af12-53ee46cac561/intermec_pm43c_ribbon.pdf
    • https://s3.amazonaws.com/jonora/street_safety_signs_worksheets.pdf
    • https://s3.amazonaws.com/rovuweraja/lowedanet.pdf
    • http://zilaxeputeso.epizy.com/liwevagu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010aed.bin
a0919b0f30dd1118ccc970ef86cc0eca1b009ec0a7a4a75850335d17725931be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AED 5188 bytes
font_01_sfnt_off00011c99.bin
03d8184ef57978f4bafe7a86eec5f4114c5c8a00950836644a8fdf1bdeca0c69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C99 11320 bytes

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