Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b596d100834faf3…

MALICIOUS

PDF

83.8 KB Created: 2021-04-04 20:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: faf2d4912f241770cefda8137469c78c SHA-1: a64068459a89f4972c2fbbb51a0a14a868f0c771 SHA-256: 4b596d100834faf38d5805d9a369706fb93a0bce4c472226a19ae76283f48823
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as benign documents, indicating a link farm or SEO spamming technique. The primary external URI, https://jumiwimov.ru/123?utm_term=circle+geometry+worksheets+pdf, suggests a lure to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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/123?utm_term=circle+geometry+worksheets+pdf PDF link annotation
    • https://cdn.sqhk.co/kapimetavis/jfKhdhd/gowil.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/5e3e9f195.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/gB4CwjV/claw_game_toys_cost.pdfIn PDF document text
    • https://sudodufutela.weebly.com/uploads/1/3/5/9/135960501/5712711.pdfIn PDF document text
    • https://lojopozubog.weebly.com/uploads/1/3/1/6/131606756/gobifomaxux.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/XNgd8hh/new_messenger_2020_apk_no_ads.pdfIn PDF document text
    • https://fokomawirofuteb.weebly.com/uploads/1/3/0/9/130969657/girowawixoxeket.pdfIn PDF document text
    • https://xapidusexinixov.weebly.com/uploads/1/3/1/3/131382907/duvipoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xavexapoxiv/Uia824w/socket-_server._c_bind_address_already_in_use.pdfIn PDF document text
    • https://cdn.sqhk.co/gozawelesutu/hShckXs/sim_dashboard_pc_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xomudufe/bizhub_c227_manual.pdfIn PDF document text
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_ad75a19c4f894baebb5857df1ab35ee6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xotomisen/kawazetusaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/57500903765.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_5e72fc52103b4180aa07d02294e28e2e.pdf?index=trueIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_04c596f2c2bb45ad94dc5b69d3ed9b1a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woberiz/free_online_printable_math_worksheets_for_kindergarten.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_ce409685984c497f8c92c66e82f38b04.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nagudo/xafagivowebowapuva.pdfIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_23ec073aa1a54bdbb04c9d87a96a337f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolina/89543692702.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_a6ffdb0fbfe24c56b11194a26119375d.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 5324 bytes
SHA-256: 10730c0abf31807590846755bf53ed8ad71bad505ce337709663c2edda2f5e87
font_01_sfnt_off00010b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B79 11596 bytes
SHA-256: 1b5456a95fc9c96e1c0dd54d48a513dc8b1bf73d404f3649200d2706a50a55ec
font_02_sfnt_off0001330a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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