Malicious PDF — malware analysis report

Static analysis result for SHA-256 b726dd138f2b9693…

MALICIOUS

PDF

81.1 KB Created: 2021-03-29 01:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b0761db0624dc082487c7f26870220e SHA-1: 3a098d07ebe81ccd09bbf9fd39c4ffd6382dd4c3 SHA-256: b726dd138f2b9693524a85ea1a3caad73c4b88169de3cee863ab85b05466423c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains, suggesting an attempt to distribute malware or phish for information. The document body, though heavily obfuscated, contains keywords related to educational worksheets, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://midufefew.ru/123?utm_term=decimal+to+fraction+worksheet+grade+4+pdf
    • http://xozowilozoga.mywebcommunity.org/good_strength_crossfit_workout.pdf
    • https://jipofaxinevafud.weebly.com/uploads/1/3/4/3/134350183/18961248695c.pdf
    • http://ruvogodozipabiv.scienceontheweb.net/elevador_de_cangilones.pdf
    • http://pogawubujogeje.mypressonline.com/how_to_use_scanner_on_thinkorswim.pdf
    • http://bekopomulasebi.getenjoyment.net/nofafolaneximiwolasamaf.pdf
    • https://nowiwadigomu.weebly.com/uploads/1/3/4/0/134018048/7279133.pdf
    • http://razejeperijifop.22web.org/jaxogiko.pdf
    • http://tiwigibafofovit.iblogger.org/75847535908.pdf
    • http://patajafurep.mywebcommunity.org/bathukamma_in_telugu.pdf
    • https://wezefumuge.weebly.com/uploads/1/3/4/6/134614004/sorivurokuxaju.pdf
    • https://dukalafaziwemum.weebly.com/uploads/1/3/4/7/134772398/6957133ad.pdf
    • http://fafikup.scienceontheweb.net/cuales_son_los_beneficios_del_betabel.pdf
    • https://teselabobebivu.weebly.com/uploads/1/3/1/6/131606188/jenimukukosafenuset.pdf
    • http://loxiturizule.sportsontheweb.net/57739552461.pdf
    • http://dimopun.mywebcommunity.org/genero_literario_de_la_obra_el_caballero_dela_armadura_oxidada.pdf
    • http://jalazekesofijot.medianewsonline.com/jerajibobodobati.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tizeruxabono.onlinewebshop.net/asnt_level_3_study_material.pdf
    • http://xajejosiwoja.epizy.com/animal_crossing_nds_rom_deutsch.pdf
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_1ba43427fcf940f981e76143b1dc7e22.pdf?index=true
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_cc18ebaff6f344f8962e1b842b5b1677.pdf?index=true
    • http://sitizef.rf.gd/ffxiv_containment_bay_s1t7_extreme_guide.pdf
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_56d26c0a23174cce83811c66418debe6.pdf?index=true
    • http://mukanebesiva.atwebpages.com/mufopamodon.pdf
    • http://bugazepoja.onlinewebshop.net/machine_learning_with_r_course.pdf
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_2b210914299e4b74aab4148207a796f6.pdf?index=true
    • http://vawanumezal.onlinewebshop.net/firuzizoxiforezakomaw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f093.bin
93b2d15f45d8875d16f1f34b9f9abfc73e0f850cf517121b971004fbe203b2b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF093 5600 bytes
font_01_sfnt_off0001038d.bin
4792fc41c5e2e3a81a13c478cc1a60f1913af29cd57ba4ce96fa4f11867beaf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 10792 bytes
font_02_sfnt_off0001288a.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1288A 4324 bytes

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