Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad20733c83590b85…

MALICIOUS

PDF

83.4 KB Created: 2021-05-05 22:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d2c5083079c6b858eaab9173f8be1b06 SHA-1: 0d7d13c71e548737b8838f049fb3161d8dec91f7 SHA-256: ad20733c83590b85b39651440d6dfc250741e4c454cd9d248e64ad2884ec75bb
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external sites, with one specific URL identified as a potential lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI point towards an attempt to redirect the user to a malicious domain for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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/strik?utm_term=how+to+read+music+notes+for+trumpet PDF link annotation
    • http://mipamuwupo.22web.org/topic_sentence_supporting_sentence_and_concluding_sentence_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/vuritukupus/fghQjeM/radha_krishna_tv_serial_photos_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/vjijajd/neo_lms_integration.pdfIn PDF document text
    • http://fuzuwozozat.mypressonline.com/medicine_buddha_teachings.pdfIn PDF document text
    • https://cdn.sqhk.co/rigowodikot/jieieig/52498170212.pdfIn PDF document text
    • http://kimujedat.mygamesonline.org/wudaturu.pdfIn PDF document text
    • http://pozuvixa.getenjoyment.net/how_much_does_a_life_skills_coach_make.pdfIn PDF document text
    • http://vojemodipu.sportsontheweb.net/31987737948.pdfIn PDF document text
    • http://wegijezunulej.22web.org/60032479551.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/iihfRjh/77362982423.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b3e249ca-0275-4474-918f-e70b2ca32861/75738726806.pdfIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_91c4a364bbae49fe805345fd0e6abc32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/petikamov/kupafejisegiga.pdfIn PDF document text
    • https://d80f29e5-b60c-4034-b355-14c03cb49cca.filesusr.com/ugd/ff44ec_91a43ba85b8440cdba3a84d15d6f2263.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d67966-dc31-4181-8dd1-f2d33ca91606/graco_4ever_extend2fit_all_in_one_convertible_car_seat_installation.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/math_worksheets_adding_fractions_like_denominators.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a162ec21-1907-4a95-84fd-83e4d12dfd47/wikirudap.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/android_binder_aidl.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/managing_stress_worksheet.pdfIn PDF document text
    • http://tesoxukezeziles.epizy.com/vabuwipojesawixo.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/physics_for_scientists_and_engineers_4th_edition_access_code.pdfIn PDF document text
    • http://zidazimimaf.epizy.com/38091992921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f21301f-15c6-48ae-a7e0-5804965015df/35110661843.pdfIn PDF document text
    • http://bajokojukitipib.epizy.com/kerala_hindu_baby_boy_names_malayalam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/334d395e-b2dd-4671-8075-e9139a430a79/how_to_make_chicken_tortilla_soup_slow_cooker.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/the_making_of_the_west_peoples_and_cultures.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 5204 bytes
SHA-256: fb7a687bfdcd8ccd081c645e77fc57d329d9385f7005e2601290964bb8fe20bb
font_01_sfnt_off000109e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 11784 bytes
SHA-256: 8ba299c4b3b1889d1fd32f125566a3ebf5c9f4dcbf739c0ba1be0a3ab1fdaae1
font_02_sfnt_off00013196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13196 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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