Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aadce7fc668e36e…

MALICIOUS

PDF

75.3 KB Created: 2021-02-28 16:23:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4044a8c7b4fa05255b8d9974ee4e8892 SHA-1: 60f503430f5c25900ba18d44fb5820122c38df45 SHA-256: 2aadce7fc668e36e015923f6c4d0aab32e7418ed0dc60f145098dd5ddc75a33a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though truncated and obfuscated, suggests a lure related to 'how to fix squeaking elliptical', which is used to disguise the malicious intent of directing users to external sites. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

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://pelibifir.ru/123?utm_term=how+to+fix+squeaking+elliptical PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418188/normal_601ee92c0e4bb.pdfIn PDF document text
    • http://jepewadagamer.scienceontheweb.net/how_to_pray_to_ancient_greek_gods.pdfIn PDF document text
    • https://cdn.sqhk.co/xumelesep/gh7rhee/zekenewil.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/TKjSiDj/pudowe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495837/normal_60354d4c4d970.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/hggfjiS/bingo_games_near_me.pdfIn PDF document text
    • http://nubebukexowi.66ghz.com/vopuvigagakov.pdfIn PDF document text
    • http://fudasoba.iblogger.org/1026674925.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/hmCRxgj/42667309399.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/91141592456.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471688/normal_5fc5a64203e91.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/frggjf3/gun_builder_3d_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384164/normal_5fcf311ce82b9.pdfIn PDF document text
    • http://sikepelisu.22web.org/hoover_max_extract_not_spraying_water.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gogewarixisude.epizy.com/ferik.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/play_store_pro_apk_google_drive.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/free_cleaning_proposal_template_excel.pdfIn PDF document text
    • http://bopevevene.epizy.com/moxapuzixokazoto.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/vositagarizozafobek.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_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 5396 bytes
SHA-256: 2254dc2bcca8041e75ae1c05b04e00b37d9068bc4d04bb262a4f3e57a5473e9a
font_01_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 10792 bytes
SHA-256: bd64050f60149bfe041ae1604a6ec42fbe826c9528e9eb65f1de522b476feccb

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