Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c7fc337376edcd…

MALICIOUS

PDF

76.8 KB Created: 2021-03-27 23:24:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3f37129170c83dfd87f77b4fbed43dce SHA-1: cfe0af22b44e1142a40cfac2107f94cf0c4d4b9d SHA-256: 87c7fc337376edcd84012fb4b4ea3441d78035514b4a65ee57ed67d162b11bb4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/123?utm_term=balancing+nuclear+equations+worksheet+answers+key PDF link annotation
    • https://cdn.sqhk.co/baluwofuk/KgiWBMR/resaxibuxobagimoxojevugef.pdfIn PDF document text
    • https://vusejamujaled.weebly.com/uploads/1/3/1/4/131437056/eca7fea1d594259.pdfIn PDF document text
    • https://julitigifoxa.weebly.com/uploads/1/3/4/3/134310533/xefajepenasib.pdfIn PDF document text
    • https://menufaron.weebly.com/uploads/1/3/0/7/130775522/rurunoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457011/normal_6033498a58fb8.pdfIn PDF document text
    • https://zogetira.weebly.com/uploads/1/3/4/5/134502553/2639486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_60422381c6c2e.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/iaqQpja/vanilla_wow_leatherworking_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_603170e46a5a2.pdfIn PDF document text
    • https://natorepoxikafop.weebly.com/uploads/1/3/4/3/134314237/xusujiporuseviboxed.pdfIn PDF document text
    • https://zixobidepupakog.weebly.com/uploads/1/3/4/5/134503699/1799532.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460983/normal_60017ff17f2da.pdfIn PDF document text
    • https://cdn.sqhk.co/lawikuto/bihieaz/funniest_kid_answers_azzyland.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/gowebabuxogiro/nopubob.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/23363710639.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/m_audio_fast_track_pro_drivers_free_download_for_mac.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_off0000e3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C8 5376 bytes
SHA-256: f381fdf30fda9457408f035ab5f17623cc1d212cf793ad85ce8a3380f89a5029
font_01_sfnt_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 10360 bytes
SHA-256: 217f128d00386df889f184b9223bf62e301343c2f81a01d5abf7e3ff9d17e5f9
font_02_sfnt_off000118ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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