Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb685b812aa0e687…

MALICIOUS

PDF

67.9 KB Created: 2021-02-12 19:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aae56670719417ce10dd31cd72cef502 SHA-1: 22d8c3e24e9dbcb09b83dea7bd85a9f3f6d43ca5 SHA-256: fb685b812aa0e687d9dcd2d1738a02b5e368a1e3f3126378b247efb002f4e335
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-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://jottigo.ru/123?utm_term=avid+cornell+notes+printable PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413846/normal_601a276e1d4df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453900/normal_60141b518aff5.pdfIn PDF document text
    • http://evromotors.net/washington_department_of_licensing_report_of_salefr1pp.pdfIn PDF document text
    • https://cdn.sqhk.co/fowurona/ghMMuDU/prison_life_rpg_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455403/normal_5fe1067023c8d.pdfIn PDF document text
    • http://ijmalan.xyz/gidemuycx8.pdfIn PDF document text
    • http://akmurzina.com/65850108944yy41l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415930/normal_600ba6881a731.pdfIn PDF document text
    • http://doctora.club/leed_ap_bdc_exam_preparation_guideeedvu.pdfIn PDF document text
    • http://feelslike35.com/balochi_dance_video83obw.pdfIn PDF document text
    • https://cdn.sqhk.co/tisorobew/CijjixT/muzegagekidix.pdfIn PDF document text
    • http://nashremont.site/ssf2_sasuke_modz8ywr.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/rfij2gg/music_notes_tattoo.pdfIn PDF document text
    • http://islta.fun/head_first_javascript_programming_a_brain-friendly_guide_downloadf4r9o.pdfIn PDF document text
    • http://lnstagram-office.com/manual_de_organizacion_de_coca_colaseuix.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/agjmPjf/34502876239.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/42671580463kbcin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mejojaka.epizy.com/number_format_js_php.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_off0000cb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6F 5256 bytes
SHA-256: 545096348cedae2fa0b195e87836e7d476d45954472a56fbcbe096c5363450b6
font_01_sfnt_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 10404 bytes
SHA-256: 6a9c8d6f616e44623500c549e6f41db9b635a0274f527873b54410ba6f0532be

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