Malicious PDF — malware analysis report

Static analysis result for SHA-256 4922ab4686dd0eb8…

MALICIOUS

PDF

79.7 KB Created: 2021-05-11 21:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e15953a87618eedc47bfd24bb12f3df3 SHA-1: 72995cf8d0e6d089512da0ae83f83d82414741d2 SHA-256: 4922ab4686dd0eb84a2beae3c3ba3fa46e857704a2a2038f21f852536b1672ed
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one prominent URL (`https://xajibur.ru/strik?utm_term=windows+batch+programming+if+statement`) appearing to be a lure disguised as a search result. The PDF structure and embedded links suggest it functions as a phishing or redirection mechanism, likely leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=windows+batch+programming+if+statement PDF link annotation
    • http://knitfqph.site/31704523358rsnd2.pdfIn PDF document text
    • http://pakekoramiduwin.getenjoyment.net/rununipifirer.pdfIn PDF document text
    • http://zikevamakag.mygamesonline.org/57219753035.pdfIn PDF document text
    • http://tazizaj.iblogger.org/google_play_store_on_kindle_fire.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/8849632132.pdfIn PDF document text
    • http://akfb.online/ryobi_epj800_biscuit_joiner_manual4q29g.pdfIn PDF document text
    • http://liwexun.mywebcommunity.org/philip_sidney_astrophil_and_stella.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://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_3ffc668a4610435fa1f66982ef8bc859.pdf?index=trueIn PDF document text
    • http://ledukuxadom.epizy.com/prysmian_group_annual_report_2019.pdfIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_ffb91402cc1f43b8bc1baaf93f06590f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd65f8cb-8c07-4a67-aab6-a1e8807d4db3/echo_dot_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcfcb092-82c4-4fec-8f01-97d5b1c9180d/how_do_i_get_a_duplicate_title_in_sc.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/sicut_cervus_palestrina_spartito.pdfIn PDF document text
    • https://77ac2d45-d533-4b4b-a85c-01e81860bff9.filesusr.com/ugd/7f1ad7_29ae0266ee8a49d98ec829ee19b303f2.pdf?index=trueIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_9e56f31848f1480ab37875b96a979c12.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sisaxu/sijupusaririlawexew.pdfIn PDF document text
    • http://nuzabasere.rf.gd/vamutulolosabewabojudaza.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/how_many_calories_in_6_wendys_chicken_nuggets.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_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 5572 bytes
SHA-256: 7393ae115ffe001ca6441a55633b5a858162322df822b40ea7908262fc02a3c8
font_01_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 11280 bytes
SHA-256: 1cf9238f8083ec06aa972ce01390a93444c1dee95792a0309bf7c0a5aed64b9a
font_02_sfnt_off000123a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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