Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ea7c2d7e127514…

MALICIOUS

PDF

64.4 KB Created: 2021-01-15 02:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ea4ccc8f3f4431e52911ff6c44fe12a0 SHA-1: d3e7fe726d8df1995e5ffee31ae1e0cb21de7033 SHA-256: 92ea7c2d7e127514cdfefd0c178a761f816994b2c21900f91d50d9f555dbeab6
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as a credential phishing lure, specifically impersonating Facebook to trick users into submitting their login details. The document contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to deliver a phishing page or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://jikiwifapa.weebly.com/uploads/1/3/4/3/134338998/giwogis.pdf.
  • 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://trafficel.ru/123?utm_term=to+kill+a+mockingbird+chapter+29+quiz PDF link annotation
    • https://site-1171887.mozfiles.com/files/1171887/onkyo_hf_player_unlocker_apk_full.pdfIn PDF document text
    • https://site-1175091.mozfiles.com/files/1175091/galaxy_wearable_samsung_gear.pdfIn PDF document text
    • https://jikiwifapa.weebly.com/uploads/1/3/4/3/134338998/giwogis.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/Cibjdge/brimnes_ikea_wardrobe_manual.pdfIn PDF document text
    • https://kunimagim.weebly.com/uploads/1/3/4/6/134608209/4299221.pdfIn PDF document text
    • https://cdn.sqhk.co/xumobopore/gcYicWy/free_post_it_app_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/sezunofubuzi/ghj8LNv/car-_categories_road_trip_category_game.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/zoragowesiw.pdfIn PDF document text
    • https://site-1172155.mozfiles.com/files/1172155/80221001969.pdfIn PDF document text
    • https://pufinixebajev.weebly.com/uploads/1/3/0/8/130873949/bimujuzoborufi.pdfIn PDF document text
    • https://site-1240055.mozfiles.com/files/1240055/88670940345.pdfIn PDF document text
    • https://xifepifedezuz.weebly.com/uploads/1/3/4/4/134495844/wadeve_gewujegera_buxolow_zuporuxeliv.pdfIn PDF document text
    • https://site-1168115.mozfiles.com/files/1168115/domino_s_delivery_driver_jobs.pdfIn PDF document text
    • https://fudolimag.weebly.com/uploads/1/3/4/5/134586879/visazibanu_tumifakiro_dokoku_sulipasul.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/fujadabez/fractions_to_percents_worksheet.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_off0000be50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE50 5924 bytes
SHA-256: 3635a2808e585ae8868985742d7e89d4d678e566ed9496ea27af3bc1bcb2f6b6
font_01_sfnt_off0000d24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24A 9644 bytes
SHA-256: 95b970eb6c49ecabcacf1b871d074dce5ee7546a214e5005eb9e52559bebc569

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