Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2e0883a23de566…

MALICIOUS

PDF

76.1 KB Created: 2021-04-28 20:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 425fea0b6a9951a569d5356cabbe70c0 SHA-1: b0a720ea9783beab16acd98220df184f70e1ec47 SHA-256: 1b2e0883a23de566d6f6f3fded207fa9a533fe876911736f83284406dc609c6f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 employing UTM parameters, indicative of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users through a network of low-reputation sites.

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://bologen.ru/strik?utm_term=eldest+christopher+paolini+free+ebook+download PDF link annotation
    • http://setofexperience.site/527932193596enoq.pdfIn PDF document text
    • http://jotijitod.66ghz.com/flight_sim_game_app_android.pdfIn PDF document text
    • http://ygrash.website/hoover_twin_tank_steam_mop_troubleshootingovq91.pdfIn PDF document text
    • https://cdn.sqhk.co/wediximewoza/77gghgh/88371640050.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/uVjdUgc/psn_monthly_games_august_2019.pdfIn PDF document text
    • http://viwigevofuwova.iblogger.org/xenurupoduxazibub.pdfIn PDF document text
    • https://cdn.sqhk.co/tesigasefaxe/ih7iaOc/nightbringer_magic_glowing_deer_live_wallpaper.pdfIn PDF document text
    • http://nout-prokat.website/fekirapunimijatejewetokunyu78y.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/jbiikN5/marketing_strategy_training_courses.pdfIn PDF document text
    • http://kyrgyztours.com/dragon_block_c_mod_1.8.9h33j5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/325b5ad1-750a-45bc-8597-af718f1feb07/perc_h700_firmware_latest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68524a51-4a64-4761-b429-83247446e49e/tuxojezigole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e806d3-55c1-4627-8c51-cef5d0b1e6f2/vudilaziberewen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b78dadc-a5e6-4933-967f-7e357d438a78/ropewexurolekiruzob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acaaa270-9bca-480b-9905-3a56715f967c/83690823768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c72aae-2b16-443f-adce-4338225e6c9b/47308944286.pdfIn PDF document text
    • http://gurepabe.epizy.com/54746160121.pdfIn PDF document text
    • http://pizobuxawefi.rf.gd/fubijuwonoxagikokitut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5b391ca-a6f7-49cd-8e14-76e498d73370/alesis_dm10x_vs_dm10_mkii.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 5496 bytes
SHA-256: d14d63c39676756991582b499eab81932d886fa6631f58ec973fb2cbaac7e52a
font_01_sfnt_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 12720 bytes
SHA-256: 7874c5150696c4732aa523ed0165694f1f074cab89457de8fa34380621861bdf

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