Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df6608fe565abc0…

MALICIOUS

PDF

85.2 KB Created: 2021-03-17 23:07:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 230f7b8659bfc28110e927eca31c0ef0 SHA-1: b8941714464c7c1dc95a902927e35de3ecb34bc4 SHA-256: 9df6608fe565abc065f3abdd57ba476fa9ecf400a198b3440f9325f1a359282f
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'equilibrium review worksheet answers biology', indicating a potential phishing or malware distribution attempt. The presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/wix?keyword=equilibrium+review+worksheet+answers+biology
    • https://cdn.sqhk.co/nuxezitowefi/kiehjKW/pejuwovezatexupekogadamu.pdf
    • https://cdn-cms.f-static.net/uploads/4498986/normal_604ae322eeb89.pdf
    • http://duzusedolatepe.mypressonline.com/chartered_financial_analyst_program_cfa_in_india.pdf
    • http://cardioactiveuficiale.site/3d_animation_movie_maker_app_for_androiddralu.pdf
    • https://static.s123-cdn-static.com/uploads/4476567/normal_5fe4d6c6318f4.pdf
    • http://nidewopovuwubo.mypressonline.com/3550502920.pdf
    • http://povulofi.mywebcommunity.org/toyota_highlander_2012_maintenance_schedule.pdf
    • http://solapp.xyz/roland_micro_cube_gx_guitar_amplifier_blackyw1i2.pdf
    • https://cdn-cms.f-static.net/uploads/4446289/normal_60193711d9b74.pdf
    • https://static.s123-cdn-static.com/uploads/4409248/normal_5ff3c942283ba.pdf
    • http://beduzevitugok.mypressonline.com/xitolo.pdf
    • http://jaxagogilexet.sportsontheweb.net/acer_chromebook_15_reviews_2020.pdf
    • http://zugugalepew.mypressonline.com/bofizaviwenuxipem.pdf
    • https://cdn.sqhk.co/parapirer/23cIYie/winatiko.pdf
    • https://cdn.sqhk.co/zirizowesaw/162jhha/wavuzipetizowaxas.pdf
    • https://cdn.sqhk.co/novitovikor/ggfjhwP/daytona_international_speedway_weather_forecast.pdf
    • https://cdn.sqhk.co/nixafusoda/jlHRict/fruit_dessert_recipes_easy_and_quick.pdf
    • http://waranijovuv.sportsontheweb.net/3rd_shift_jobs_dallas_tx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zavinawotomuvef.epizy.com/moving_powerpoint_templates_free.pdf
    • http://gitavini.epizy.com/wasting_time_on_the_internet_kenneth_goldsmith.pdf
    • http://tediguku.atwebpages.com/canzoniere_download_gratis.pdf
    • http://wadoromutisagar.myartsonline.com/abbie_hoffman_steal_this_book.pdf
    • http://xuxixezatazifax.epizy.com/lofinodaxazasifazuri.pdf
    • http://sowiveporumege.epizy.com/24307755158.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bb9.bin
c97e3fb2c754e87aafe41d5c700238b225d5ac4672a03f9345453d0d1ac1d065		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 5640 bytes
font_01_sfnt_off00011eda.bin
a6233fd1231c3e0676179fc41abde4d5847e84fbf4374c6df156d7c744c3d617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 11824 bytes

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