Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc64a237ae4671ab…

MALICIOUS

PDF

78.4 KB Created: 2021-02-03 01:20:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 77975009cae48c4c51fce5f6a4bc31ad SHA-1: 00bdd3395be28e981d0d56725d0c56df5d20c2a5 SHA-256: fc64a237ae4671abd90478ba23f00539de8687a3bab4e9afec27ab9f7b555c69
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/aws?utm_term=agilent+34970a+software+free PDF link annotation
    • https://cdn.sqhk.co/zejovedelali/jihnhjk/french_coffin_nails_long.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473432/normal_5fff144eb15a2.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/aS1y19z/cbse_class_8_reduced_syllabus_2020-_21.pdfIn PDF document text
    • http://world-wild-shop.com/planet_fitness_apply35f6y.pdfIn PDF document text
    • http://crysety.xyz/anthony_giddens_sociologiattewn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367625/normal_5ff0618fe7e3e.pdfIn PDF document text
    • http://introdom.ru/how_great_thou_art_ppt4lscb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416496/normal_6015385f6f076.pdfIn PDF document text
    • https://cdn.sqhk.co/nufopusifa/9gdhg0w/11937187880.pdfIn PDF document text
    • https://cdn.sqhk.co/kerikone/Rjeq2GG/93607036743.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/iihnOjg/shooter_2d_unblocked_games_76.pdfIn PDF document text
    • http://apsmall.space/tefimik0wdip.pdfIn PDF document text
    • https://cdn.sqhk.co/kirorakoxu/jMgdrif/15734579250.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/mawesenasijoser/asterix_comics_free.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/xefubutasitixezore.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/broadsheet_melbourne_cbd_pub.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/tusaguf.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_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 5436 bytes
SHA-256: ff6091c38afd5a26e7b3b72e407012b58afe167497559eab90cb573b9ec2bde4
font_01_sfnt_off0000fb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4F 10224 bytes
SHA-256: 7083bd1813553e74fb3f26ece8621943c41fc8fadc8dc07a252d847e9aa5934e
font_02_sfnt_off00011e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E13 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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