Malicious PDF — malware analysis report

Static analysis result for SHA-256 3959d34fb3bb1f84…

MALICIOUS

PDF

75.0 KB Created: 2021-02-28 22:56:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6d0fcd81eceeac4221555b9736ee2e6a SHA-1: 3642a087244102f1dcc76ca126aa25b252fb49f9 SHA-256: 3959d34fb3bb1f846dfe95fe2ba18762352011a52b67e827d5ddb967bf0a3cc7
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9817

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://bologen.ru/award?keyword=do+you+make+money+selling+monat PDF link annotation
    • http://zifosazoniduve.22web.org/nekiderufokozizidiloti.pdfIn PDF document text
    • http://rapisakaxo.66ghz.com/elegant_business_cards_templates.pdfIn PDF document text
    • http://potenciy.xyz/63208630577cz0qp.pdfIn PDF document text
    • http://hdvideo.design/a_streetcar_named_desire_study_guide_student_copy_answersvio49.pdfIn PDF document text
    • http://retenenu.iblogger.org/formal_maternity_wear_south_africa.pdfIn PDF document text
    • https://vedalamiru.weebly.com/uploads/1/3/0/7/130776143/fa559f3b4f4.pdfIn PDF document text
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/e820116fe.pdfIn PDF document text
    • https://nebuxegakox.weebly.com/uploads/1/3/4/4/134404726/devukufalok.pdfIn PDF document text
    • https://govepemifowen.weebly.com/uploads/1/3/4/3/134372812/gupidex-xobanorigu-sodepova.pdfIn PDF document text
    • http://agreevudb.rest/gramtica_adriana_figueiredoemgj0.pdfIn PDF document text
    • http://twitter-center.com/warhammer_fantasy_roleplay_3rd_edition_character_sheetahwcq.pdfIn PDF document text
    • http://rabisuxegebe.iblogger.org/pugumom.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/economic_development_jobs_montgomery_al.pdfIn PDF document text
    • http://xulenegutuwovi.iblogger.org/html_to_api.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pesafitibum.epizy.com/feelings_list_nvc.pdfIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/suzunilifejonoworokavan.pdfIn PDF document text
    • http://lawuzuzadi.rf.gd/38676912288.pdfIn PDF document text
    • http://xulelaperimiku.epizy.com/mitifu.pdfIn 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_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 5072 bytes
SHA-256: efa4579392017da0fbd34d2c1bc71b2b9162f9bf7f94ed2f56b57ef89bcc62c3
font_01_sfnt_off000103da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 10704 bytes
SHA-256: ed2c812859b2c74d7a683bcee6c52d0181ba78a85954b040069670d6f8c9c7a9

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