Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2b9bc563d3d9de…

MALICIOUS

PDF

107.8 KB Created: 2021-04-21 14:39:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0007e9a9833b502befc938310af7da3c SHA-1: 6a03c6d84ecff374d551df1fa8423a5603ea28f9 SHA-256: 4a2b9bc563d3d9dece6fe39b1122fbcf287797cbac9509c9d70bea4ae8ea86c7
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are associated with link farms, indicating a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious document, likely a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lozipotod.ru/strik?utm_term=hp+j4680+power+cord PDF link annotation
    • http://zisuroto.mygamesonline.org/introduction_to_machine_learning_with_python_a_guide_for_data_scientists_1st_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/jiz46jb/90242362243.pdfIn PDF document text
    • http://gopadaxin.mywebcommunity.org/anisocorie_etiologie.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/best_books_to_learn_mathematical_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/0gfijcL/extreme_landings_mod_apk_3._7._0.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/vinebesatixeg.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://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_4b6e57c7b2594192a794255982d2a65a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b902947-2947-4309-bf73-3664ea830829/pakokupane.pdfIn PDF document text
    • https://6b21c484-99f8-4e97-b77a-b77c054bfe5d.filesusr.com/ugd/f139d4_8b5b7ed293864cdeabbf0f7d79922283.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wulagisi/management_reporter_budget_not_appearing.pdfIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_8642842f9f5048df89f884d3e0a8a65e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sajezife/43530763373.pdfIn PDF document text
    • http://wuragumok.atwebpages.com/getamafuvakopikobibikiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d2edaed-dd4f-4bb5-91e5-13872a0ea696/how_to_give_training_to_sales_person.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b83842c-468d-45d4-ad84-c7ff2e0fa8bf/dunazepolavarut.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/41682618279.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/48889473439.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000146df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DF 4908 bytes
SHA-256: c62b7a2a6c4c8eef778d57c732a8c8ecbac3bb05e5131b5bb16b54ad2658d287
font_01_sfnt_off000157a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A8 11092 bytes
SHA-256: f295f1575d2af4d0f269142967a69676bdc68ecbc80d45ae2982f21a3acc1fe2
font_02_sfnt_off00017db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DB5 16172 bytes
SHA-256: afa46fe8782843d7766e3a623a4ba2ad089407227e9b57a4c6b66cd732929971
font_03_sfnt_off000192e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192E1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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