Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e87b85f140f0141…

MALICIOUS

PDF

76.7 KB Created: 2021-04-02 16:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d13d83720beb8399a903a1233b657f88 SHA-1: 561dda4723571678410d192cd6410888fda3839c SHA-256: 4e87b85f140f01417c6b7c1aaf5caa4b634ec36d61687a97b0c0be53aadca807
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://bologen.ru/award?keyword=cbse+class+9+english+book+beehive+pdf PDF link annotation
    • https://buwenesuxunuga.weebly.com/uploads/1/3/4/8/134883777/kevovukixitubigebuxo.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/gehbhhd/joxobimoranivanugelusewa.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/xilogerigiratusagin.pdfIn PDF document text
    • https://sewusadata.weebly.com/uploads/1/3/5/4/135401056/gigajuwuritij-vudob-xemokesof.pdfIn PDF document text
    • http://ligovezedeje.iblogger.org/structure_of_athenian_democracy.pdfIn PDF document text
    • http://rutenowataba.iblogger.org/clinical_pharmacology_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/3Ucjjge/16900251747.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/42c5012d-b82b-4872-a20d-c53c0c0cc4ae/what_should_i_put_in_my_time_capsule.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/55973373004.pdfIn PDF document text
    • http://rovuwuruw.epizy.com/oxford_dictionary_look_up_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a60cff79-b5db-402f-bcf7-1949ae16466e/south_carolina_dmv_permit_test_book.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/lenejijudeniwafur.pdfIn PDF document text
    • http://soranodabiwegi.myartsonline.com/juwib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57a80208-f2d0-49ed-ba6a-8c32714e37dc/zogizola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ecad649-e46e-4cd4-94ef-f28347f1a352/xikixagifowan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79113302-8a23-4364-adf8-78241618209e/gisirukogujonetimavetabi.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/fofuratonajis.pdfIn PDF document text
    • http://vumovofun.onlinewebshop.net/60238340836.pdfIn PDF document text
    • http://kemesid.onlinewebshop.net/nerilad.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/nigumovilibetizul.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_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 5648 bytes
SHA-256: 779f0bcd0fbbf89ec7e14d712fc165a177b0970d85d1b27013f741918fd0c7c3
font_01_sfnt_off0001015d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 10512 bytes
SHA-256: 6ef143c3deeb257004ede6ba9e55a86ded594767c0b0ba1a374dc5aff5cafa3e

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