Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c90a7bd2beb665…

MALICIOUS

PDF

65.2 KB Created: 2021-02-26 20:37:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 517f52071f6bc09045459f471002fd12 SHA-1: f6e4ef1387086ff3d7a156cca22771c92b5b3fe4 SHA-256: 76c90a7bd2beb6655ee29a776d496a7eadb1b6d284a6691e93a5c1e8fae89b2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=brother+xr3774+bobbin PDF link annotation
    • https://cdn.sqhk.co/bolomadu/ehfijje/idle_robbery_mod_apk_download.pdfIn PDF document text
    • http://tactical-jacket-sale.shop/is_the_wall_show_riggedyetmh.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/can_you_track_priority_mail_international.pdfIn PDF document text
    • http://vazutokidoxe.iblogger.org/hydraulic_accumulator_circuit.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/PPxjbnl/arizona_state_park_camping_coupon_code.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/stephen_covey_first_things_first_worksheetsunjci.pdfIn PDF document text
    • http://hook-up.fun/shelter_in_place_order_texasr2f6x.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/jhbdeI0/miwepumisuwatugupixetonow.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/fusebofezesijunori.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/48747855185.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/epson_home_cinema_1040_manual.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/boxakarobodago.pdfIn PDF document text
    • http://vpntop.info/mezezodofisokojogakinesudjter0.pdfIn PDF document text
    • https://cdn.sqhk.co/vomuvojovi/ggjwhdi/there_you_go_again_phrase_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/anciYxw/american_football_games_free.pdfIn PDF document text
    • http://suzenax.22web.org/luresud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mimodiko.epizy.com/life_of_pi_online_book.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/gambar_apel_untuk_kolase.pdfIn PDF document text
    • http://mukanebesiva.atwebpages.com/32285773826.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/incident_report_sample_letter_for_lost_receipt.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/what_is_the_meaning_of_the_little_prince_story.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/92803288139.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_off0000c535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC535 4940 bytes
SHA-256: 092e1ef39a3aeaaf5f906b04b86630eb79159be5779bb76f3c027165f0fbece8
font_01_sfnt_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 9864 bytes
SHA-256: 3816932dd0a3210c02504f80f9e25cf6f73106dbc42e6ad9185e2cdedaa62dbc

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