Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a4efb5ce9ac712…

MALICIOUS

PDF

79.1 KB Created: 2021-05-07 18:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 83fa824b11e90d4872ce5bdead09f6e3 SHA-1: 54201cb9da31799a3b187d5a76e103b89eed04b1 SHA-256: d1a4efb5ce9ac712f18da4acbe1ad665e5bc644825c9b40f5e7e951d8916e69c
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 0.9997

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://baarspo.ru/strik?utm_term=samsung+rf323tedbsr+ice+maker+parts PDF link annotation
    • https://niwosegebopusa.weebly.com/uploads/1/3/4/5/134583118/dijekodiwimoru.pdfIn PDF document text
    • https://sedawuxel.weebly.com/uploads/1/3/5/3/135326539/kosijowunogaru.pdfIn PDF document text
    • http://fakts.design/yellow_gold_shirt_template0539y.pdfIn PDF document text
    • https://cdn.sqhk.co/pategazikiw/hd6rOHB/netflix_canada_account_management.pdfIn PDF document text
    • http://xamojopilupivo.scienceontheweb.net/electrocardiograma_de_6_derivaciones.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/dkxjg9C/zukiziragifegu.pdfIn PDF document text
    • http://parhelifrl.space/solarwinds_network_performance_monitor_datasheet4cwma.pdfIn PDF document text
    • http://bimizuzi.sportsontheweb.net/96199094301.pdfIn PDF document text
    • http://tipografiyav.moscow/33514493740hdcje.pdfIn PDF document text
    • http://kexolifowuj.medianewsonline.com/92148196336.pdfIn PDF document text
    • http://gejurabek.getenjoyment.net/gestion_contable_y_gestin_administrativa_para_auditoria.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/the_authorized_king_james_version_of_1611.pdfIn PDF document text
    • https://cdn.sqhk.co/sebidurubuze/hJafyhd/98490583381.pdfIn PDF document text
    • https://cdn.sqhk.co/tuponapalab/ZtY6rjj/hit_it_fergie_lyrics_rap.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/obidkic/applock_fingerprint_pro_apk_revdl.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/14305029612.pdfIn PDF document text
    • http://jakartapro.xyz/57100740039vioal.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/free_printable_blank_bingo_cards_for_teachers.pdfIn PDF document text
    • http://esagafow.fun/why_wont_my_garmin_nuvi_connect_to_my_computer4qvg5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/94557366699.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/ante_nicene_fathers.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/json_formatter_html_code.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_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 6044 bytes
SHA-256: f868ebaffc4663911228a4e1030926c2056339780e28d24060215e1c2cf1fc67
font_01_sfnt_off000109a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 11216 bytes
SHA-256: 3f1fd2a16665dd067812754514c153ce5eddf95a617ae85b0368b6e9b0878d52

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