Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2f77fd652866f1…

MALICIOUS

PDF

77.0 KB Created: 2021-02-28 20:15:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4b16cc6dea624c81f99a9532983be68e SHA-1: 97e503c71ff80337fde96057373399547d343b58 SHA-256: 9f2f77fd652866f1b757979e8eafaf6ba3f1795d6eeb4e43000940ef5a3ee55b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=nikon+coolpix+l310+battery+charger PDF link annotation
    • https://jateredadiwez.weebly.com/uploads/1/3/1/6/131606262/rewebexegawuwotesomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496165/normal_601375e2140e1.pdfIn PDF document text
    • http://biweekamnf.com/what_is_the_theme_of_love_in_the_time_of_choleraqlv80.pdfIn PDF document text
    • http://poroda.site/82098467344db5vx.pdfIn PDF document text
    • http://xufaroruguvotel.iblogger.org/pazedozel.pdfIn PDF document text
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/7781176.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/vojadizotupuram.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413235/normal_5fcb9d05a7c01.pdfIn PDF document text
    • http://complerbnp.com/15409044992qggvd.pdfIn PDF document text
    • http://artdebug.site/muvuks8lxn.pdfIn PDF document text
    • http://dulomagukide.22web.org/introduction_to_mathematical_thinking_book.pdfIn PDF document text
    • http://kleomaften.online/fear_the_walking_dead_imdblfxpt.pdfIn PDF document text
    • http://zatakifi.22web.org/edema_cerebral_difuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427097/normal_5fd189056f0d4.pdfIn PDF document text
    • http://kogawanitikip.iblogger.org/zujigebe.pdfIn PDF document text
    • http://stalekost.site/european_accident_statement_form_avivaq6sf1.pdfIn PDF document text
    • http://netewe8.xyz/rabiwirimudirzbh3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kadekosaraf.epizy.com/the_things_they_carried_quotes_chapter_5.pdfIn PDF document text
    • http://kebafitesulodu.epizy.com/xaxujonomaxasire.pdfIn PDF document text
    • http://sobuzazan.rf.gd/fiwixide.pdfIn PDF document text
    • http://xagexof.rf.gd/gematazeme.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FC 5720 bytes
SHA-256: 6f45a3a7ad611f01032963ac7cbb982576a42b62f9820743c5cda24a0ca18692
font_01_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 12044 bytes
SHA-256: 074032a7486b708fc7a4d8cb5e1316a541894797dad1929fc6fbdf1d50161a46

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