Malicious PDF — malware analysis report

Static analysis result for SHA-256 2612433c14f2d8c3…

MALICIOUS

PDF

80.6 KB Created: 2021-03-14 18:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9f78261d5c393cd1eafd8462dbf36804 SHA-1: 47df01333e920cfd689c4f5ff60c39f7d6206846 SHA-256: 2612433c14f2d8c396c5da5eb2d4bbc10bde6974f9a2f87927500abf73d7ce90
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting or suspicious domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a potential tactic for SEO manipulation or traffic redirection. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/award?keyword=que+es+historicidad+pdf PDF link annotation
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/loguw.pdfIn PDF document text
    • http://mif-smeh.space/zeroxugowodemejhzi3.pdfIn PDF document text
    • http://huaweistoreukr.xyz/ckz_origins_hacked_apk_downloadociye.pdfIn PDF document text
    • http://hangzhoumetal.ru/how_do_you_reset_a_samsung_refrigerator_after_a_power_outagevkv9q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492600/normal_5fee975473656.pdfIn PDF document text
    • http://legendbilisim.com/chapter_2_research_format_exampleko1jc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369917/normal_5fdeee4b65943.pdfIn PDF document text
    • http://lesantyqas.online/what_is_development_class_10thj9sbz.pdfIn PDF document text
    • https://kodopikowi.weebly.com/uploads/1/3/4/6/134659436/pebuvexa.pdfIn PDF document text
    • https://zitipijasidigor.weebly.com/uploads/1/3/0/8/130874434/lonabi_dekomudum_daxafixupe_dogusa.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/english_verbs_with_meaning_in_marathi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408335/normal_602904f3abddd.pdfIn PDF document text
    • http://remont-pc.website/lulapetufomaxyh476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480155/normal_603fd92a21862.pdfIn PDF document text
    • http://good-production16.site/bunker_hill_security_dvr_troubleshooting3nh2n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_6022ade92cbbe.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/dinigugaxej/ration_card_number_format.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/ctet_solved_question_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/memories_bring_back_you_meaning_in_telugu.pdfIn PDF document text
    • http://mikijanux.atwebpages.com/blackstone_real_estate_partners_ix.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_off0000f9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 5272 bytes
SHA-256: 806ed87f851995eaafb8205faaaf58b689bde211eb8fbcaa17bf8f44cdab76fd
font_01_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 12864 bytes
SHA-256: b402931de58d16ce304a440675f8c8676bc3df4dbb1f4e8f644c1e5467e579af

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