Malicious PDF — malware analysis report

Static analysis result for SHA-256 4754d62a8af2b3d1…

MALICIOUS

PDF

81.6 KB Created: 2021-03-22 01:52:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2abe65e7a96d865fc599323e4a1d1f1e SHA-1: e19aae1ab388762437f6a0d375ad49941364e576 SHA-256: 4754d62a8af2b3d17bb4a50636430fa1e1b63033ff110dceb92dca7904509999
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/123?utm_term=phd+thesis+template+docx
    • http://cashthe.ru/disputing_judgements_on_credit_report2eva0.pdf
    • http://pavajevubuj.iblogger.org/41863212827.pdf
    • https://xepozumer.weebly.com/uploads/1/3/1/3/131380160/defit_pagetilo.pdf
    • http://fineagencyy.com/chronicles_of_amber_tv_series_2020ucsk4.pdf
    • http://metaleagle.ru/tulifumot1j7vf.pdf
    • http://xenuven.22web.org/bullet_journal_weekly_spread.pdf
    • http://martakkord.ru/jobogoxorexc8df4.pdf
    • http://perevod24-card2card.site/music_instrument_store_near_me_nowsfyq5.pdf
    • https://warimeso.weebly.com/uploads/1/3/4/7/134720830/wuwotitasorune-kezonafikas-devofexawopiron.pdf
    • https://cdn.sqhk.co/wuwexosul/WbrheS1/46810276716.pdf
    • https://cdn.sqhk.co/suxidixip/QjiIihD/super_soccer_snes_cheats.pdf
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/kananake-daraz-mebuwonude.pdf
    • http://baffer-shop.space/serenade_of_water_piano_sheet_music7tn9c.pdf
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/1321940.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gadiwovujema.epizy.com/alone_movie_songs_audio.pdf
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_ee42dc3903f1405aa9c7ff22ae525064.pdf?index=true
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_e2d3cd4b6d4f4758b5399ea2fbcd59d2.pdf?index=true
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_6634734f5c65418780de70f15ef0b375.pdf?index=true
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_432f35dc8440400cb967ff46855afea2.pdf?index=true
    • http://puwojewemuxa.epizy.com/10078930485.pdf
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_28b4882f3de344a6ba384624e7e31795.pdf?index=true
    • http://lobexot.epizy.com/parent_newsletter_template_word.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df3d.bin
f0774a14eacde3a28d74ce9355a56cd69be2bf0f13b584cda1fdefcef2a30e1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 4968 bytes
font_01_sfnt_off0000f025.bin
69b5b46b8b1fbbc112ee9510956675e3c5bac5c248cec31c283de7a3d849170d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 10852 bytes
font_02_sfnt_off00011554.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 16204 bytes
font_03_sfnt_off00012a81.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A81 4324 bytes

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