Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b99f4e14979c42…

MALICIOUS

PDF

73.8 KB Created: 2020-11-10 20:21:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 10d880c4343a7d371df227f21bcd72f1 SHA-1: 17c4eb08e6a9129430fb46723dab900ba79bb7f0 SHA-256: a2b99f4e14979c42630077a89da2be6ac9bd2f772cd97ea3dde92823e5badf08
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, disguised as a download for an iPad mini instruction manual. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL is the primary indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/123?keyword=ipad+mini+instruction+manual+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445881/normal_5f9cc221693a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_5f94aebd8627f.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/faserubafa/bowflex_xtreme_2_pulley_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c6b5ba-e123-4f42-b375-3bb90ccb992b/52298183054.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/kolejomusudepasaludebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/602afc49-8247-4d57-b47c-82919d7ea147/zefosajolitigiwob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9fd6eaf-0af7-4249-9229-5d4a0a9155bf/one_mans_wilderness.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/ship_trap_island_map.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/pobewilokakuvitipolatizix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5538e1a4-ce4c-40c4-9a3d-b44fc36f8e43/desenupefetanunaninimeb.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/orbital_box_diagram_for_potassium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/974c5f8b-ffba-45c4-8825-eec2b83ce37c/lost_books_of_the_bible_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/53007179004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db99814-7ee4-4a3c-989b-447baffd45c6/tozol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 5012 bytes
SHA-256: be32b3f963977cdd2b0eb93f0e5f7f3d32289e84f2e00cc6dc68f3af03742cbe
font_01_sfnt_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 10524 bytes
SHA-256: abdcf52185858a0b54bc6ebfc09958e4fc3ac264773cf6533e763013d7950c9b
font_02_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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