Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4009127b995e99…

MALICIOUS

PDF

76.9 KB Created: 2021-03-02 05:19:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7f66fdf138a7d99a617ec6df7c732f21 SHA-1: 6c2dbaece2cfe9b14095256144b3c6bf5227707f SHA-256: fb4009127b995e99982f1b19fbf4196641fef60ffcc90e7d5e85e22a6c26cfcd
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and the overall structure point towards an attempt to direct the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=how+much+does+it+cost+to+get+a+tankless+water+heater+installed PDF link annotation
    • https://cdn.sqhk.co/dolafita/dRjb3he/stickers_de_free_fire_apk_traspasar_paredes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_603969953fb47.pdfIn PDF document text
    • http://grizhoff.ru/sims_4_mobile_mod_apk_iosyijuu.pdfIn PDF document text
    • http://dirtygirl.fun/jonusudanimuxutuwatajalai8ni4.pdfIn PDF document text
    • http://gadosamu.iblogger.org/amana_commercial_microwave_parts_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_602113272e5d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480582/normal_5ff54e7e9bf4a.pdfIn PDF document text
    • http://tazasimeli.22web.org/42515670660.pdfIn PDF document text
    • http://czecheducation.space/audio_record_from_messengeri4l92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_601787d54a6dd.pdfIn PDF document text
    • http://maslovauto.ru/63056369736xowaw.pdfIn PDF document text
    • http://everydayy.fun/26709694679p07dx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367680/normal_5ffaa3d85a7ab.pdfIn PDF document text
    • https://cdn.sqhk.co/zurajekiviw/hNodXhi/49917177405.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://wutewak.rf.gd/tebikaguvafabuvesapo.pdfIn PDF document text
    • http://bedekopezedegej.rf.gd/alg_ii_antrge.pdfIn PDF document text
    • http://mimodiko.epizy.com/9001752463.pdfIn PDF document text
    • http://ribaxekag.epizy.com/kuxebujagesegunulu.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_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 5352 bytes
SHA-256: fa4222b65d727fbcb4bdc4fcaaf01b2c3177dc4c89d8cbb3cd61e546e16910c2
font_01_sfnt_off0000f3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 10588 bytes
SHA-256: 7485667563a0c1fdf08f54d4525fe562cd72dcb60bfd147e152f9f5c2aeb7e34
font_02_sfnt_off0001178e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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