Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f068185ffe8a697…

MALICIOUS

PDF

78.2 KB Created: 2021-03-30 09:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3724df79541be2c354726db6bc687b33 SHA-1: df7bdcafb1a05499f6ade195b0269755f45fed6e SHA-256: 4f068185ffe8a697d9333604b0a47120e716f22394bf988b0a6fcfc7736351cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of suspicious external links suggests a high likelihood of distributing further malicious content or engaging in deceptive practices.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • 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://jumiwimov.ru/award?keyword=burial+rites+pdf+free+download PDF link annotation
    • http://wbigs.space/factors_affecting_motivation_slideshareaoi9v.pdfIn PDF document text
    • http://construt.site/what_happens_in_city_of_lost_soulszvgdf.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/ijWhbOE/moxolepetejepib.pdfIn PDF document text
    • http://antileqphh.site/96431390376cxztv.pdfIn PDF document text
    • https://dunojezeb.weebly.com/uploads/1/3/4/5/134586234/4266226.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/jjjbWM1/boss_day_office_games.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/0icheig/number_matching_cards_printable.pdfIn PDF document text
    • https://zosumomaxin.weebly.com/uploads/1/3/4/0/134040430/wexul.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/ibjaIja/sagimon.pdfIn PDF document text
    • https://nilukosezaxed.weebly.com/uploads/1/3/0/8/130814529/31d4d9622809.pdfIn PDF document text
    • https://cdn.sqhk.co/wanadujogo/gzKeH0A/videos_engracados_do_whatsapp.pdfIn PDF document text
    • https://pujawemufupu.weebly.com/uploads/1/3/2/6/132680931/8574689.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/jaWgNgh/gmail_contacts_in_outlook.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/TThfjiR/mobizen_mirroring_apk_full_version.pdfIn PDF document text
    • https://rodofuzox.weebly.com/uploads/1/3/4/5/134599037/bobuligevuzumi-mavimijip-gogaw-fikojiv.pdfIn PDF document text
    • http://ibkreactiva2020.com/audio_technica_at-lp60_fully_automatic_belt-drive_stereo_turntable_with_usb0k82v.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/dhgjhew/wivepagex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_3fabc0b4f19e4b028166fda6142f7ddf.pdf?index=trueIn PDF document text
    • https://592f3795-292b-4eb7-bb82-ca7d83343d16.filesusr.com/ugd/44d997_dd78e053037d4d558eb81b51510efd99.pdf?index=trueIn PDF document text
    • http://lenawukefiraba.rf.gd/suzimeduzusuwerelaru.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_3990a7db9df84a6e800df5d67035da62.pdf?index=trueIn PDF document text
    • http://tefesapebeto.rf.gd/washington_state_unemployment_calculator.pdfIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_e4baa760dd6d4525ba53d5c1112edc51.pdf?index=trueIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_57e05e8237fe4eeaacbb65f1f34fad57.pdf?index=trueIn PDF document text
    • http://zajepatexesa.epizy.com/how_much_should_i_charge_for_video_production.pdfIn PDF document text
    • http://miginuguf.rf.gd/3354898350.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 5176 bytes
SHA-256: 9457dd0fe51504f3a139e3f4c642ba90dc5b7c392cb0ea2785b9873060bf72f5
font_01_sfnt_off00010420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10420 11436 bytes
SHA-256: 28dfc441681bf2548677c549a11bd711eb77363ed9d691add69d4d5e350cac4c