Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d7fc0c05ba0086…

MALICIOUS

PDF

76.9 KB Created: 2021-03-16 00:14:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d284993fbb105d3f39b0915c9408fd79 SHA-1: d460e59f71ca8b7bc81b169920ddc468f53f0673 SHA-256: 51d7fc0c05ba00869ce3b94aa1957eb6c9211da4ca1cfb33e56a5093464790c0
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://ponafet.ru/strik?utm_term=hcf+and+lcm+worksheets+for+grade+6+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483624/normal_600fb3c48ff75.pdfIn PDF document text
    • https://xuzipitazejaj.weebly.com/uploads/1/3/4/7/134722028/bc7b06365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418188/normal_60302829465ce.pdfIn PDF document text
    • https://xilapisozigiv.weebly.com/uploads/1/3/4/3/134341565/8040103.pdfIn PDF document text
    • https://vixevugipun.weebly.com/uploads/1/3/5/3/135327752/40b05dd1bc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385647/normal_600484555dfcf.pdfIn PDF document text
    • https://bikezurikol.weebly.com/uploads/1/3/4/6/134612173/8ddf20e33485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410695/normal_603e2880e0024.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/655bb634-d4e1-4aef-ab18-e3c3677a22aa/18074004277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f6a1a72-412a-4117-9d28-4231245c8249/beats_solo_pro_comparison.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/55545791640.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/moon_river_frank_ocean_piano_chords.pdfIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_6cb8587f247b4b868ac92c515fb81d10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/masevewi/harry_potter_and_the_half_blood_prince_xbox_360_gameplay.pdfIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_d78c28c78c574a6dad83cd66a320f8c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/02287b39-b43a-406c-a5ba-104b512c9acd/leledipemozitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e43c30c-7fcd-4094-b506-358982da52ba/how_to_reset_i500_tws_airpods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49713b43-8e8a-4d3b-a278-43c66b04d228/wordpress_show_login_history.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_off0000eea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 5704 bytes
SHA-256: d1ae2f68233b08a0e68f3a48a7b6a12097f4bb85975ba03a57209dde91a503bb
font_01_sfnt_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 10884 bytes
SHA-256: 8aa228000a40a7d8239ab0c559edf618400283ce73b2e288b8bb2471a9e3e64d

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