Malicious PDF — malware analysis report

Static analysis result for SHA-256 8343b8c26f84ecb9…

MALICIOUS

PDF

73.8 KB Created: 2021-04-01 04:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a27a651e2d80f5d66c970218e2af691a SHA-1: 5a553e1a63f5b0cd8cc0b75e32981e39c70618a1 SHA-256: 8343b8c26f84ecb9134a44c836d9874ef43a96df27ec3143fb0ba0c9265f8839
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

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 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.
  • 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/wix?keyword=rainbow+vacuum+model+d4c+manual PDF link annotation
    • https://cdn.sqhk.co/mapiwoda/o2hiphd/outbreak_undead_gamemaster_s_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/zsghjHp/zigarofidisivob.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/hMheDjh/53036511794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382421/normal_6063f358edf73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417305/normal_600bca71599de.pdfIn PDF document text
    • https://cdn.sqhk.co/powitaxixu/PgiGhhw/anime_mobile_apk_2017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_6054cca508078.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/punagilelabon/89527504100.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/business_conference_agenda_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/standards_based_bulletin_boards_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/what_is_cost_of_court_marriage_in_india.pdfIn PDF document text
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_4962fb89c46541679ce8490cdaa7683a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivuxo/2019_weekly_monthly_planner_template.pdfIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_b58f5b8b68cf4577aace165b95e2aec9.pdf?index=trueIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_25b266d0555546f6a8d09e3b278995fe.pdf?index=trueIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_a94c2ef50e224ca3b8515a113cbc1fc3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/rudram_namakam_chamakam_malayalam.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/cpt_for_piriformis_muscle_injection.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/36870738217.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/968226264.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/rimor.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_off0000dfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC8 5196 bytes
SHA-256: 37a04cc5af6f35c0a1d5da30440c6fbeaa8c56688a95e1d59e588b355a7f8b98
font_01_sfnt_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 11456 bytes
SHA-256: 25b39e15c5f232c2c9a3b16a2ccdc1ca7b8ea8675f6b5a9d8089f45646359723

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