Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1597816e129f47…

MALICIOUS

PDF

76.6 KB Created: 2021-03-28 21:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ec7f003fe768b49765c75e93fc67e980 SHA-1: cfc8620395e958be93ca35ebcb0486b5fc38aee0 SHA-256: 2b1597816e129f47f3346b045ec8c4f47c2a96a5614cab8bbcb74ba0a1fffc3d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL patterns are consistent with spearphishing attachments designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/award?keyword=balancing+chemical+equation+questions+pdf PDF link annotation
    • http://wazepewazivulil.mywebcommunity.org/how_much_money_do_you_win_on_family_feud.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/hf9Mnmx/bowling_games_free_online_fun.pdfIn PDF document text
    • https://cdn.sqhk.co/xafelaxadoju/yjj6hjM/46601754647.pdfIn PDF document text
    • https://cdn.sqhk.co/buzosefif/cjeieji/gijominudadiruxa.pdfIn PDF document text
    • http://lnstagram-office.com/8237801704999m4w.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/how_to_multiply_and_then_add_in_excel.pdfIn PDF document text
    • http://bioforce-co.site/4_pics_1_word_level_2611d75zl.pdfIn PDF document text
    • https://cdn.sqhk.co/rukeditele/ER7jhgj/11868454348.pdfIn PDF document text
    • http://nnorm-id.com/access_database_2010_tutorialqueg0.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/bIEFjfY/54596803429.pdfIn PDF document text
    • https://cdn.sqhk.co/banijuwa/aCwchfQ/80475628586.pdfIn PDF document text
    • http://cabinetsop.xyz/781920221474b0ic.pdfIn PDF document text
    • https://cdn.sqhk.co/tudosiki/dhg5TRL/snake_attack_3d_simulator_anaconda.pdfIn PDF document text
    • http://autoport76.online/cisco_packet_tracer_old_version2hzng.pdfIn PDF document text
    • https://cdn.sqhk.co/nonatedogo/iahjgiw/kuwawopovejazomup.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/i0kLejh/44613611117.pdfIn PDF document text
    • http://sportplays.ru/siminorogegatupol29mfl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xedavabawavela.onlinewebshop.net/fefimuj.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/canal_street_movie.pdfIn PDF document text
    • http://muvemaxadal.onlinewebshop.net/fedex_freight_economy_bill_of_lading.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/gamete_intrafallopian_transfer.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/84563396329.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/91889649161.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_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 5648 bytes
SHA-256: 1d412e4141ae899a74c5c93eae042e591cffd8b987d2906af20e7d376b8cb1a1
font_01_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 10588 bytes
SHA-256: 15bfad3849291c4dfe9f8fa76eb4a19ea4f9c7c3dd0810681fe8cc1c7ec8fe05

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