Malicious PDF — malware analysis report

Static analysis result for SHA-256 6278c7d5096aa61e…

MALICIOUS

PDF

74.9 KB Created: 2021-04-16 23:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 06bcb2a315be57906bc700acb578f730 SHA-1: 60e2f675279db14ff82daff97712e7396bb0bc13 SHA-256: 6278c7d5096aa61e55f52ace5ac583fadf40449bb457ee13b2ecd6e8287e79d3
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by an ML classifier as malicious. The document body, though heavily obfuscated, suggests a lure related to learning word processing, which is likely a pretext to drive users to the malicious domain. No scripts were extracted, but the presence of many external links indicates an attempt to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://jacksth.ru/strik?utm_term=how+to+learn+word+processing PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486971/normal_606caa270fd29.pdfIn PDF document text
    • https://bupekotarox.weebly.com/uploads/1/3/0/7/130739944/labuxibokisari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486563/normal_603166efc6960.pdfIn PDF document text
    • http://fiwadewemizoti.iblogger.org/90313595605.pdfIn PDF document text
    • https://lipisowuke.weebly.com/uploads/1/3/5/3/135387266/14253c.pdfIn PDF document text
    • http://adminhalil.com/battleground_s_survivor_battle_royale_mod_menucieuy.pdfIn PDF document text
    • http://thestablestl.com/fizajake2z1oh.pdfIn PDF document text
    • http://rurojewof.22web.org/dumibitev.pdfIn PDF document text
    • https://cdn.sqhk.co/vomuvojovi/cRQQheK/just_dance_2019_controller_xbox_one.pdfIn PDF document text
    • http://nukels.xyz/example_of_conversationalekpzk.pdfIn PDF document text
    • https://cdn.sqhk.co/ximepadogi/jgfibZh/wonoduw.pdfIn PDF document text
    • http://retalili.iblogger.org/kuromadarutezisefefilelul.pdfIn PDF document text
    • https://mefifusefom.weebly.com/uploads/1/3/4/2/134266023/2126925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424330/normal_606b98195745f.pdfIn PDF document text
    • http://compte-cmbretagne.best/jenetigixidadudilijofijiziauv8.pdfIn PDF document text
    • http://torchland.xyz/324114592802hfum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kozosugija.epizy.com/ibn_arabi_ertugrul_actor.pdfIn PDF document text
    • http://poxelisenaxoxig.epizy.com/little_shop_of_horrors_musical_cd.pdfIn PDF document text
    • http://gimokami.rf.gd/catabolismo_y_anabolismo_de_acidos_nucleicos.pdfIn PDF document text
    • http://daluxufugul.epizy.com/87493220959.pdfIn PDF document text
    • http://fovelemuzawela.epizy.com/algorithmic_game_theory_tim_roughgarden.pdfIn PDF document text
    • http://vuriwemofoto.epizy.com/what_has_white_revolution_led_to.pdfIn PDF document text
    • http://gapifemesi.rf.gd/wibawadilivewarebazafonem.pdfIn PDF document text
    • https://medlineplus.gov/medwords/learnmore.htmlIn 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_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 5292 bytes
SHA-256: 77b2c4dff1e8a876841cf1567b310f4396ae0c12655fd733ed42643d8d180b5b
font_01_sfnt_off0000fa3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 10432 bytes
SHA-256: a9974ebb0a9bf3b90e2c75b380c2c47383676fbac700a1c16e32a5542b2b8ec3

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