Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b1d89a45c6a63e…

MALICIOUS

PDF

77.9 KB Created: 2021-03-25 07:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b5db8ffb16bc4f5dd74fc3fc888dbe5f SHA-1: 1376fd5a1459d47a6d8270358a20074130b32500 SHA-256: d8b1d89a45c6a63e2887c3d4f17ed2634b34aaa7409537aea9b3c322996c63ba
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 and employing UTM parameters, indicative of a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the classification. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=what+are+the+best+finance+podcasts PDF link annotation
    • http://cmb-accueil.com/language_a_reader_for_writers4t0xy.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/5iiJhfP/lemabanobevuwonodusijisig.pdfIn PDF document text
    • http://glav.info/78279745090tb9g6.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/hBm41Xn/33051823762.pdfIn PDF document text
    • https://cdn.sqhk.co/wixumenez/cgcIvjf/ants_on_a_log_recipe_with_pictures.pdfIn PDF document text
    • http://thiswaytovogue.com/adding_fraction_worksheet_tess9k7z.pdfIn PDF document text
    • http://digogipexoluku.iblogger.org/building_drawing_book_free_download.pdfIn PDF document text
    • http://livecopyrightverification.com/zalitisaditiqnixb.pdfIn PDF document text
    • http://begetus11ppz.xyz/what_does_strokes_gained_off_tee_mean0ovxp.pdfIn PDF document text
    • http://rudajudo.iblogger.org/76461431894.pdfIn PDF document text
    • https://cdn.sqhk.co/penomufepuk/ejeyPhf/diwebob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_7dab06e3f6c442a7af177afd377a8489.pdf?index=trueIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_b710a58874b043f0b55b92191e7a4e2e.pdf?index=trueIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_7f4fa4e7e57f473781446f53646a7542.pdf?index=trueIn PDF document text
    • http://lufeneweb.epizy.com/dutufitegowajuku.pdfIn PDF document text
    • http://dopugidov.rf.gd/strength_training_anatomy_third_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00cf5ada-57e3-4f06-b4a4-0672f3077270/favififolekibowojujineze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ca19d2f-a00d-47ac-8904-b80c47cdc684/57751642330.pdfIn PDF document text
    • http://jaxegowanav.rf.gd/olympus_tg-6_vs_tg-5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cddb850e-91fe-4f00-82bd-9da715c27bcd/que_causa_punzadas_en_el_cuerpo.pdfIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_14f0f0720da7446b8293b5c043ba596f.pdf?index=trueIn PDF document text
    • http://sosozodazu.epizy.com/75096416448.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_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 5364 bytes
SHA-256: 6fa384d964ad756c1fe44ab9370da0ed740769613b25881670811b05affaedcc
font_01_sfnt_off00010458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 10572 bytes
SHA-256: 4aa3b2627c02ddc7bcb4440e1c825b744401703233a194199a46a4711fd0fd3f

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