Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b1d055dfd3f447…

MALICIOUS

PDF

72.9 KB Created: 2021-02-24 00:23:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 46ad48e31c70b843968e9aec94366274 SHA-1: b6c39c1980a3cb486008fbbf26051bd67996f60f SHA-256: 66b1d055dfd3f4475606dc14aa94eaf763ed2a1d91397d99caebc7f1cb53ea13
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or SEO spam campaign. The primary URL points to a search query for a washer manual, which is likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/wix?keyword=maytag+performa+washer+pav2300aww+manual PDF link annotation
    • https://cdn.sqhk.co/pamavunawi/gignido/russian_rider_online_hile_apk_indir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495849/normal_5fced0dcf423c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_6028651a5b92b.pdfIn PDF document text
    • https://zejuvuvegodefi.weebly.com/uploads/1/3/1/4/131453892/5516906.pdfIn PDF document text
    • https://cdn.sqhk.co/komagiju/jicaghJ/rarosar.pdfIn PDF document text
    • https://mosutija.weebly.com/uploads/1/3/4/5/134502389/polar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371005/normal_5fe2d3c199760.pdfIn PDF document text
    • https://jukejifoka.weebly.com/uploads/1/3/5/3/135311866/giduxe_vebokom_gofimegof.pdfIn PDF document text
    • https://tapogizixe.weebly.com/uploads/1/3/4/8/134897788/fekakegega_vinake.pdfIn PDF document text
    • https://gamuzajebi.weebly.com/uploads/1/3/4/4/134481120/tizumimogikujil-dekedidoxusejin-sajazogituler.pdfIn PDF document text
    • http://logorag.22web.org/change_management_behavioural_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/iiKtjab/super_nintendo_mini_game_console.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447641/normal_5ff88036ddccb.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/zazelujeju/firefox_esr_52._1._0_64-_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/laboratory_safety_manual_includes.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/customs_declaration_form_philippines_2019.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_off0000e02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02E 6012 bytes
SHA-256: e93f507c76f1360e38a58ea7da54078aa4cece37f1ad9c07342b0c52a739c793
font_01_sfnt_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 9856 bytes
SHA-256: 86f7cf733d6ca9c6275131a8016f30a0d29b594149d193d6db1fc335ae6b15d1

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