Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4da503829ff8d89…

MALICIOUS

PDF

77.1 KB Created: 2021-03-26 09:52:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 88b8e35bad65101b4280e52231945dcd SHA-1: 89b5cb9cd00e66bdd27a78a360dc900ddfdbb35a SHA-256: a4da503829ff8d89d48132fb88c4b1ca302a10493dd7b7cf40d9e2a70aaccb7f
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 0.9997

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://botokaw.ru/123?utm_term=hangouts+app+apk PDF link annotation
    • http://rowowesofazov.medianewsonline.com/ludevofuneme.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/iiieiiY/77913346980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_60501442736d3.pdfIn PDF document text
    • http://volelovapudexif.scienceontheweb.net/central_termoelectrica_ciclo_combinado.pdfIn PDF document text
    • https://cdn.sqhk.co/juxajomuz/jy6iby1/evil_nurse_stories_scary_horror_games_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/ejigdKd/nolokejexakazibifupur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466657/normal_5fde65e820f4c.pdfIn PDF document text
    • http://xiruzox.mygamesonline.org/dell_optiplex_9020_mt_i7-4770_specs.pdfIn PDF document text
    • http://milesatel.mygamesonline.org/ngo_annual_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495402/normal_60586425d7a0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gezetega/picsart_blur_background_hd_images.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/45090754163.pdfIn PDF document text
    • https://2a0daf8d-7d8f-48a8-9da6-1f2c606fcb3a.filesusr.com/ugd/adb9e1_13fdc99cf92d42fda7dc1ddee2529eaa.pdf?index=trueIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_2c7b5d63ff194925a118ecf4d767221d.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_36aa51c00bb343a6bf6c50be00bb7a75.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/16866003429.pdfIn PDF document text
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_8c1a6f86cec14adc89cbd2648315cbfe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/ama_citation_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/49904718791.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_824ae18b323f4ff18d27ded09474cfe7.pdf?index=trueIn PDF document text
    • http://bavatesivo.myartsonline.com/honda_gcv160_parts.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_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 4884 bytes
SHA-256: 7d0fd70653000ed9e747dc5450c950e4e3afd11896e138d6d7dc35f2a7497be1
font_01_sfnt_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 11020 bytes
SHA-256: d6e7061e1aa8f0dab54bcce920a732e6332051fd9d678cea186c6a8b31adc401

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