Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b5b1b5f9323556…

MALICIOUS

PDF

92.6 KB Created: 2021-02-27 00:24:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d1f3da67028acf1ce4d8e1cc68ff8dac SHA-1: 2106fd17f4bd87ba3319da0a1297776bceb8c149 SHA-256: 41b5b1b5f9323556d45f2dd88ee6a2654f4fe9f1452636e4adaad8b047d25a46
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 numerous embedded URLs, many pointing to disposable domains, and one prominent URL that appears to be a redirector with a UTM term. The document body, though heavily obfuscated, suggests a lure related to 'engineering mechanics'. The presence of multiple external links indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=what+is+engineering+mechanics+and+how+to+classify+it PDF link annotation
    • http://getcabinets.xyz/22385224509fyppv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476765/normal_5fdee046c0f88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490377/normal_5ff5882889b60.pdfIn PDF document text
    • https://gixifufu.weebly.com/uploads/1/3/3/9/133999878/bekanon_wirep_jimasalate_guweger.pdfIn PDF document text
    • http://extraevents.ru/smartthings_kwikset_910_codesoli6a.pdfIn PDF document text
    • http://hookup154.space/bianca_nieves_y_los_7_toritos_chapter_39yfg3.pdfIn PDF document text
    • http://kadabafomelu.66ghz.com/bolero_ravel_music_sheet.pdfIn PDF document text
    • http://samekado.22web.org/wososevidul.pdfIn PDF document text
    • http://hotita.fun/how_to_balance_chemical_equations_examples67d8y.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/bilinear_transformation_solved_examples9tl7q.pdfIn PDF document text
    • https://zutuvolesem.weebly.com/uploads/1/3/0/7/130775525/sezuro.pdfIn PDF document text
    • http://raliwoze.iblogger.org/mappila_album_songs_mp4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406464/normal_5fec08fa4b9a1.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/impact_of_social_media_on_youth_research_paper.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 2216 bytes
SHA-256: 7294ea19b4d4988d669ca3d78a60f6aae99338d372bec2e56e584de7a63f0a1e
font_01_sfnt_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 5644 bytes
SHA-256: 23ad2ad15cc700f2bf8b94135a686ab107ed6931ed3505f2cee889acba0b159b
font_02_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 12804 bytes
SHA-256: f66813e2485f1ff5fdf891b2f96b6fca2276d3050cdab5920e6af04baaa9b46e
font_03_sfnt_off00014fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FBF 16036 bytes
SHA-256: bc1c1644e30597ae0beaac312b9749a82b64e26c109397326cdc67fdbaf2fe17

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