Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83ccc72b2e7898e…

MALICIOUS

PDF

95.3 KB Created: 2021-03-02 13:45:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8e617d83c66e4028b91c8d1b440e95e0 SHA-1: 5109fc106fbbe91bfd4e7a64ded4b1f9928a5fa2 SHA-256: b83ccc72b2e7898eb5324dcf8929da2ac239da19d654d89e5dcc340ee9c7695e
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://pelibifir.ru/strik?utm_term=quimica+organica+definicion+e+importancia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462775/normal_5fd0fe8908490.pdfIn PDF document text
    • http://zelafagilu.iblogger.org/doctor_zhivago_original_movie_poster.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/ibPVheU/transferwise_phone_number_new_york.pdfIn PDF document text
    • http://notikewokiri.iblogger.org/87500610912.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484093/normal_6004ae883e76f.pdfIn PDF document text
    • http://kexipisibufexur.22web.org/clifton_court_forebay_fishing_report.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwesedujila/drhhHgc/best_heart_rate_monitor_watch_accuracy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424953/normal_60021a0f84591.pdfIn PDF document text
    • https://cdn.sqhk.co/xupotuferu/jfofsge/wingsuit_flying_accident_bridge.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/cjjI69X/86040682652.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375344/normal_5fcf3dae16191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477635/normal_5fe770699ccd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427282/normal_603afd2e4fb53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469626/normal_6039d9a11960b.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
    • https://s3.amazonaws.com/tuletivotarupu/patebib.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/fisuziwojanumowibuvif.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/14734485292.pdfIn PDF document text
    • http://ramapenutizawa.epizy.com/puvelakifofaragibo.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_off000124a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A4 5208 bytes
SHA-256: c660e003de70cae87400b55bc28ac722199185ee88ca49d7cf812ed917eac2af
font_01_sfnt_off0001363a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363A 12812 bytes
SHA-256: 5596a28c91cee217924d7f81f028e8c1124a8680ec8022d8354bbcac40fd24e3
font_02_sfnt_off00015fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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