Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fca8df15376da13…

MALICIOUS

PDF

76.0 KB Created: 2021-02-24 07:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 16ffd880526987b392ee5ed0b95930c9 SHA-1: 5f5303e2ff4547f0638da73e3324943b0f77b77f SHA-256: 1fca8df15376da1307f637232df4242164b65b8c60a9962eac013b33060b87fa
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://druttle.ru/strik?utm_term=free+easy+ukulele+songs+sheet+music PDF link annotation
    • http://jsexj.fun/83508600169ga7nf.pdfIn PDF document text
    • https://cdn.sqhk.co/visunexabore/b4Qidjb/nubomegibobeba.pdfIn PDF document text
    • http://gufutaca3.xyz/man_swinging_golf_clubao592.pdfIn PDF document text
    • http://ihsteam.ru/describing_clothes_worksheetszhn6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_6018cdc6ed8b6.pdfIn PDF document text
    • http://myimperfectmomlife.com/injury_report_patriotsp73z2.pdfIn PDF document text
    • http://wavepolabipal.22web.org/medical_report_online_uae.pdfIn PDF document text
    • http://tehnotop.store/667409691118hnck.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_602a3f4837962.pdfIn PDF document text
    • http://titanovyi-filtr.ru/vujibo38s5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376105/normal_5fcf005bd3abc.pdfIn PDF document text
    • http://zatoboyvibor.fun/cambridge_igcse_chemistry_study_and_revision_guide2y8sy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xofogijatoli.epizy.com/aetna_provider_claim_appeal_form.pdfIn PDF document text
    • http://lemujiv.epizy.com/background_png_hd_free.pdfIn PDF document text
    • http://zefojebenodimu.rf.gd/qu_significa_el_nombre_de_keila_en_la_biblia.pdfIn PDF document text
    • http://wutodabegaf.epizy.com/greensleeves_what_child_is_this_sheet_music.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_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 5336 bytes
SHA-256: 35be0c663eb9434666975e8fd7c80f4a6185526f9ccb8b68d78b7920d7689505
font_01_sfnt_off0000fc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 11732 bytes
SHA-256: 279e68939354fb43fe5e712b927887be8b83d6485f6f9e4d414f7b48e0a690fc

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