Malicious PDF — malware analysis report

Static analysis result for SHA-256 48429b1ba22593a7…

MALICIOUS

PDF

73.5 KB Created: 2021-06-06 07:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 008ce912c2c1d6d596998b1f475eeb04 SHA-1: 9f91634cd80f91d3612a1929d7721336a733d876 SHA-256: 48429b1ba22593a7022ae22e66c6be25626c38d921099a49d2f2ef73647b01d3
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 0.9996

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://nomylo.ru/pbw?utm_term=difference+between+monocot+and+dicot+stem+anatomy PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390383/normal_5fef47b4dbd4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413564/normal_6025c7c808bf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415739/normal_6052d3073473f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417327/normal_5fc9fb382756d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413976/normal_5fd08d765f2fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474475/normal_605d91e67f660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387811/normal_6029da375224c.pdfIn PDF document text
    • https://rugekake.weebly.com/uploads/1/3/4/5/134518704/fafajewu.pdfIn PDF document text
    • https://rubasabavajexo.weebly.com/uploads/1/3/6/0/136028040/tasisorowi-zubutawabik-pikebig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390373/normal_60280ddc5fa38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487416/normal_5fe3b3f868891.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445333/normal_6001158d7ebd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465555/normal_5fdedc4c7e33d.pdfIn PDF document text
    • https://wuwawibef.weebly.com/uploads/1/3/4/6/134608234/wefina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452594/normal_60baa70fc9762.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xulajirose.pbworks.com/f/electrophorus_lab_answers.pdfIn PDF document text
    • http://fokurid.pbworks.com/w/file/fetch/144683529/dilobozed.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144704442/71967145980.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/tejabarutadifepa.pdfIn PDF document text
    • http://bowawesup.pbworks.com/f/76309191634.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/w/file/fetch/144600510/figulotozisejejepivetu.pdfIn PDF document text
    • http://taxoxuf.pbworks.com/f/how_to_get_touchgrind_skate_2_maps_for_free.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_off0000e15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15F 5468 bytes
SHA-256: 69bace292c3913a205596a0f02d042f3f612e3e5ea2ad46ca5f26d6a299fac4b
font_01_sfnt_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 10964 bytes
SHA-256: 6d51b49f2ef362e8b274f495cc0a8dad1c43490ef5fe77f6629d8e57ad6ce35c

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