Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bdfdc8f6ea5113…

MALICIOUS

PDF

134.2 KB Created: 2021-03-02 18:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 47e4af702181504fe568740d51fadf3c SHA-1: 212d8534598ee7b9b695d13bead2b339d51d6ed0 SHA-256: 37bdfdc8f6ea5113cd44793242859f23c8660dc9577871c6d5f90efade81e7dc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of embedded URLs suggests an attempt to redirect users to phishing or malware distribution sites.

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://jumiwimov.ru/wix?keyword=pictures+of+rosa+parks+family PDF link annotation
    • http://oyuncuxx.com/los_secretos_del_inmortal_nicolas_fl1c0jf.pdfIn PDF document text
    • http://bigmagazin.xyz/65514861705be1sm.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/19937077323.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/limewawixebivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459323/normal_603c38186ce1e.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/52169131437.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449774/normal_5fc72d90c45ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444884/normal_5fcce58b58e6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428039/normal_601e0b5c41358.pdfIn PDF document text
    • http://classkaod.ru/dinaratowadazojilinilcfanf.pdfIn PDF document text
    • http://domainlimax.xyz/duxumo3ismr.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/what_is_the_theme_of_the_poem_kubla_khan.pdfIn PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/how_to_write_a_reality_tv_show_pitch.pdfIn PDF document text
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/20b109a.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://sabiwilurase.atwebpages.com/html_css_js_learn.pdfIn PDF document text
    • http://jimarol.myartsonline.com/delujamadedojelipab.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/knot_tying_practice_board.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_off0001c4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4FE 5104 bytes
SHA-256: c2c21d56e93f4c0b2ae38f4762dd62c69c2e471d712aec210c614d71d6c34065
font_01_sfnt_off0001d66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D66D 11208 bytes
SHA-256: 8d77da9416398d2f8be47c7733f4cd9f1816699ab7488e28c1ce584758ae812c
font_02_sfnt_off0001fcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCB6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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