Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a40416755c2b36a…

MALICIOUS

PDF

86.5 KB Created: 2021-03-14 03:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 76402246f822f57cc2f81b827a8cbb78 SHA-1: 13386340767f8a63e9438e31fc5bbabf4f99bb92 SHA-256: 4a40416755c2b36a2096cc1e35100545bce6e4a6215c83270950c0f4d456ca8e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=cheap+midi+usb+audio+interface+driver+windows+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369905/normal_604679e436b30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501654/normal_5fe498b94f6f6.pdfIn PDF document text
    • https://kiwitelovig.weebly.com/uploads/1/3/4/3/134358902/lubemibogafukozuliv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393752/normal_6019afdd97da4.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/53571462492.pdfIn PDF document text
    • http://zzzmmmmejjj.space/plot_of_heart_of_darkness_by_joseph_conradw95pl.pdfIn PDF document text
    • http://shop-profildoors.ru/tixorafunixunisaviwapiv3j5gk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479916/normal_602c6cb6ed50e.pdfIn PDF document text
    • http://lnstagramverifycentre.com/gunisofejaxfk.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/zunup.pdfIn PDF document text
    • http://sibuvre.com/can_i_use_vicks_cool_mist_humidifier_without_filterocx44.pdfIn PDF document text
    • https://pibubeje.weebly.com/uploads/1/3/4/3/134374065/2326802.pdfIn PDF document text
    • http://gdztut.com/descargar_11_minutos_paulo_coelholx047.pdfIn PDF document text
    • http://kisuzolaki.22web.org/supopubadexu.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
    • http://jonesojawu.myartsonline.com/jogijipowexi.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_6b0eabdf51ae4154b2557676d15715db.pdf?index=trueIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_a404b7a96a344fb691fdd591b6fb4aac.pdf?index=trueIn PDF document text
    • http://fafusew.rf.gd/88277209130.pdfIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_bff4d6daad1943778bf23b65fdf19e36.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_02511fa1160c4d38ab3c4f4305cf776f.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012000.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12000 18092 bytes
SHA-256: 8e4abab4bd670a2948ead50218973abd60d8e6ae755fc2dfa13599407a16db75
font_00_sfnt_off0000e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 5752 bytes
SHA-256: b0471d10558ab6bfd6646c59427f4361f50d4cfcddbe1bf7a9ea29e3b0dd6791
font_01_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 10804 bytes
SHA-256: d7e49a0f1e00a360329e76c0f0b83bf0f51c7a021ba82e9a16028c5c15acfbf1
font_03_sfnt_off00013bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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