Malicious PDF — malware analysis report

Static analysis result for SHA-256 72beee3d7e8b4229…

MALICIOUS

PDF

76.4 KB Created: 2021-04-11 21:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2ccc5a9671acbe227e42817fa928a1ec SHA-1: 65672ed23bbc0e1ca1e5d2db9d53b90541f8f6ad SHA-256: 72beee3d7e8b4229b6bda1c0effbbc2c3fe31108d3ed87a607b47fce08ae4722
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating an attempt to lure users with seemingly legitimate file names to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=wing+chun+1994+full+movie+english+subtitle PDF link annotation
    • https://cdn.sqhk.co/joxusozomilo/hdt5uK9/driving_school_2016_mod_apk_download_uptodown.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_5fd7a6a6ecf2e.pdfIn PDF document text
    • http://prizinsta24.online/youtube_music_80_s_love_songsscea0.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/jdcJ2gh/baby_gap_near_me.pdfIn PDF document text
    • http://terem.space/formula_3_2020_driversa5sor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407571/normal_601104f4300f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414514/normal_5fdc773623545.pdfIn PDF document text
    • http://cesaregaspari.com/sanidry_sedona_dehumidifier_pricelk53o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389090/normal_5ff42ea715427.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/cookie_sheet_organizer_rackgkf76.pdfIn PDF document text
    • https://cdn.sqhk.co/gozolijitow/UnXidhf/cake_recipes_easy_at_home.pdfIn PDF document text
    • http://apparentlyopt.com/22019730472odz8o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/45972026879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4122ba4-3931-4e2d-98b2-0c6ba70a30a0/how_to_bypass_thermal_switch_on_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ff98e59-343d-4ebc-a855-4d31ec739bd2/dotisunuxivefaki.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/cacheflow_web_timer.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 5380 bytes
SHA-256: 362827410b86ab4c475b3fef14ecd47422afd57866a0a5cd619aebd5287cc396
font_01_sfnt_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 10872 bytes
SHA-256: af1566efdd6b459a6cf7ba027da17209ac4fe80a6e0a7e1c34c09c51ba8f8c51
font_02_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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