Malicious PDF — malware analysis report

Static analysis result for SHA-256 a483c363a49ff934…

MALICIOUS

PDF

77.9 KB Created: 2021-03-15 23:28:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9d5f1cc22531ef4a70d9a5a96c42e6d1 SHA-1: 59da5f43fedb7b8765a9e03642391bb5086c4d44 SHA-256: a483c363a49ff93440dc0d1f6de8c8bff2a9f6d1214c0ede2e9b502b3ada433b
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 0.9998

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://fokemale.ru/wix?keyword=kinemaster+premium+apk+4.11.16 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419629/normal_600f1aac82d28.pdfIn PDF document text
    • http://wowitaly.pro/posibevas95y6z.pdfIn PDF document text
    • https://lorebanoga.weebly.com/uploads/1/3/0/7/130738704/titijanogupasu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477638/normal_6026390f3682a.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/dshejg2/tadazaximexisoramoxa.pdfIn PDF document text
    • http://idclick.cash/navien_tankless_water_heater_how_to_clean_air_filter6l7vw.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/gWQTggS/duzazagaxo.pdfIn PDF document text
    • http://stikc.xyz/vogupidofegijedigupiyuqb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426060/normal_5fe2e65166735.pdfIn PDF document text
    • https://dopijixofovaje.weebly.com/uploads/1/3/4/6/134692352/rovuviwu.pdfIn PDF document text
    • http://shop-you.xyz/xevusizugitewimajsoekl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367308/normal_60089ad3efb3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407781/normal_6036ac92c4302.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/f3jgAic/epic_books_teacher_login.pdfIn PDF document text
    • http://b0xberry.online/kojuzenomegatobuvemerifii473f.pdfIn PDF document text
    • https://cdn.sqhk.co/zatuwifezub/eijBxai/buvaferisogepapex.pdfIn PDF document text
    • https://rotolakudezi.weebly.com/uploads/1/3/4/0/134041133/3a9328.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/how_to_open_drain_valve_on_bradford_white_water_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/bogonap.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_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 5292 bytes
SHA-256: b93bf371659884affa061fbdc93e4b522089adbb5911acdeb95deb8fc3f73f5c
font_01_sfnt_off0001042d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 11500 bytes
SHA-256: bd4e59f14433fbd1cfaca5e20a18d8b6281776a696a0fad1410ae269731f04f1

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