Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebff5e703d6d7450…

MALICIOUS

PDF

71.8 KB Created: 2021-03-05 01:23:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 936e4df06c7ca21417c72178520b3dc7 SHA-1: 9f73ea0dce52257df8f0c24371d142ed2fb42a03 SHA-256: ebff5e703d6d74500a59fb8f5e49c7482e14ac6f5f757c32272d82b2e63da288
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'Danby kegerator owners manual'. The presence of external URIs and link farm heuristics points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=danby+kegerator+owners+manual PDF link annotation
    • http://yewes.space/23519450587goyhs.pdfIn PDF document text
    • https://cdn.sqhk.co/pubusudes/cjeqia4/protect_the_girl_apk_download.pdfIn PDF document text
    • http://dipurenirexo.22web.org/divorigegajubafoxojakiva.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/arabic_font_style_in_english5ceql.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/6LXgjmN/crowdsourcing_examples_wikipedia.pdfIn PDF document text
    • http://richteam.site/jejapivabogizuxesewumblzs.pdfIn PDF document text
    • https://cdn.sqhk.co/gagupedoxut/khhvL6w/how_to_use_light_meter_app_for_plants.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/gjjgFif/68491874469.pdfIn PDF document text
    • http://swiss-gear.shop/75438249255xgu39.pdfIn PDF document text
    • http://mon-compte-cmb.best/99484089407o1qib.pdfIn PDF document text
    • http://obschee.xyz/ritevedelenoyo1zr.pdfIn PDF document text
    • https://cdn.sqhk.co/rorefevobo/e9hgBgg/swat_elite_gunwar_3d_sniper_elite_shooting_games.pdfIn PDF document text
    • http://tophomework.space/to_kill_a_mockingbird_by_harper_lee_free_audiobookyrqdk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fezekugagow.rf.gd/how_to_add_oil_to_a_pro_lift_floor_jack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b61d45e7-4477-4d24-9772-7696d1aa1e71/derujazosejakuzusuve.pdfIn PDF document text
    • http://xibobok.rf.gd/zubidosukidazidofixoses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c09d67df-9478-4f17-9763-4314a7e6f934/27016495650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad716c7d-1a9f-411f-9ef7-082972ad23ee/diono_radian_3qxt_vs_3rxt.pdfIn PDF document text
    • http://xazinipigoxowe.epizy.com/shoot_hunter_gun_killer_game_uptodown.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_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 5404 bytes
SHA-256: decb55dac2dd567f8974e802ea5ebe6d367b590d79b960c5949011452336f641
font_01_sfnt_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 10688 bytes
SHA-256: 4df6fa825355e1dcf777c7235b4c6f73535de6d1a4c8a17504296c3c54d42664

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