Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4606a5c3c43b0e4…

MALICIOUS

PDF

76.8 KB Created: 2021-03-09 05:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 3c57c9fe6cae615d6bb1ffa91e44e6c4 SHA-1: ad42108ff6de65bda2e39f27b8250a1771a94ba9 SHA-256: f4606a5c3c43b0e424cf28081ce320d358a24543188bee7337cdb6da1014cf18
126 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is a link farm on disposable hosting, with a primary external URI pointing to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs point towards a social engineering attack to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/123?utm_term=best+android+adventure+games+2019+free PDF link annotation
    • http://garantiya62.ru/what_are_the_strengths_and_weaknesses_of_transformational_leadershipzvpzm.pdfIn PDF document text
    • http://kmplitka.shop/far_cry_5_koop_zu_drittg7h6d.pdfIn PDF document text
    • http://salebox.shop/majunuvipe8m2u.pdfIn PDF document text
    • http://zonedelukekide.iblogger.org/adobe_acrobat_std_2017.pdfIn PDF document text
    • http://leomannapov.com/13300864430skthh.pdfIn PDF document text
    • http://datinge.site/gartner_magic_quadrant_2020_public_cloudyku7y.pdfIn PDF document text
    • http://jisijopimif.66ghz.com/44602502946.pdfIn PDF document text
    • http://hayatevesigar.online/annovi_reverberi_pump_xrv_4g.32djnvf.pdfIn PDF document text
    • http://alsamcctv.com/halo_the_fall_of_reach_book_quotesfut0t.pdfIn PDF document text
    • http://blacklaser.ru/culottes_patternh23vb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_5c4650ea0b28496a8744e33da0e3f27c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae97fbdf-4174-4118-be2d-ea3217d8df30/jomunozesewenediki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2758759e-1ce0-4b2b-88d8-fed182d71468/acurite_thermometer_manual_00606tx.pdfIn PDF document text
    • http://gugujis.epizy.com/59922952869.pdfIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_0abd17c8aa674322901c177d146faa9c.pdf?index=trueIn PDF document text
    • http://wivowutone.epizy.com/gebuzofavem.pdfIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_104cf5a2a7734259af00ec0907c0fa38.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_befc4c0dc172451c86e97d05c0fe805e.pdf?index=trueIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_4aa9dfebc76040af950cba23596d92cf.pdf?index=trueIn PDF document text
    • http://firosuvidafodi.rf.gd/zotunerefasaxusukivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35a7ed8d-72c1-46dc-978b-75f0373fd754/how_does_a_tiger_protect_itself_from_predators.pdfIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_0548ac8a54d14f438c4f742032237914.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 5788 bytes
SHA-256: 28fb51b2e6c839fcd98d2fda66e71a6fb5492fa66c7b7ade6e981561d70ce445
font_01_sfnt_off0001019a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 10612 bytes
SHA-256: c86242538ced3a90b5b643e8f1a8134e101ac2dc47fdbdafc71c1e19e23310fa

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