Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff579b1698eff880…

MALICIOUS

PDF

76.2 KB Created: 2020-12-19 20:32:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9938f7aa6586cedbedc196011e1f8899 SHA-1: 144e3c5fd55c1c65932a54c73ea57102de202d1d SHA-256: ff579b1698eff88046b457a62140ad61c16ae3aeb208c7485d7e446022feda39
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://traffine.ru/123?utm_term=crossfit+training+program+for+beginners+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427499/normal_5fdd5d53ec4a4.pdfIn PDF document text
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/rejibakasaba_xaxodaz_dizun_peposetipuxef.pdfIn PDF document text
    • https://jedurabononip.weebly.com/uploads/1/3/1/4/131453193/1896599.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/3189729.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/rofimigaso-gegugiranijemo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc57c6e085bf90c0e1c1b48/t/5fceb8b3efbed7192ce064ad/1607383219314/71584620133.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/jewexalali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7899da59-3572-4a32-b4ee-0b00ff43755a/38663987725.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/in_the_tall_grass_movie_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c8de6cb-79a8-4ed3-8434-ffdf5f2d5a94/google_account_manager_6._0._1_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/horizontes_del_suelo.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_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 5376 bytes
SHA-256: d4c74e956694fd81d9aa0076a8b417e8c5a523c2e934d4a199241249490829d9
font_01_sfnt_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 10608 bytes
SHA-256: cfce52682b56949ac2a1675575082b26e7acdffaa01ab379a180b9f0afab0cbb

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