Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66f84db50ddb7d0…

MALICIOUS

PDF

67.9 KB Created: 2021-03-26 07:14:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b893b8eb663b7fb406031ae99a33001f SHA-1: 3451d294e07dc8fbd560a33e6aee887d77c02027 SHA-256: a66f84db50ddb7d0f95a0cda0a5fa432792d404de4331972c73885f2c6b67d85
186 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 0.9997

Heuristics 6

  • 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.
  • 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://dugedepap.ru/strik?utm_term=rasterlink+6+full+download PDF link annotation
    • https://cdn.sqhk.co/modesinilofe/dDnW1mu/69534099008.pdfIn PDF document text
    • https://cdn.sqhk.co/gadujotev/hficgeJ/lowe_s_stock_price_history.pdfIn PDF document text
    • http://nebo-baikala.ru/arabic_fonts_free_for_windows_74dpzi.pdfIn PDF document text
    • https://cdn.sqhk.co/xegigujatefa/jiwsgcA/rotator_cuff_surgery_cost_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/ilmdMje/paris_rex_game_online_free_play.pdfIn PDF document text
    • http://premial.su/ninitekimuminaleraziqhrd.pdfIn PDF document text
    • http://itawegan.fun/rosafesozm8p33.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/jhgvhhS/world_bowls_atlantic_championships_2019_live_stream.pdfIn PDF document text
    • http://menetufebev.22web.org/handprint_outline_template.pdfIn PDF document text
    • http://romeoplanet.club/phthalo_blue_red_substitutesryn8.pdfIn PDF document text
    • https://cdn.sqhk.co/tomibigi/cujey5H/15779762828.pdfIn PDF document text
    • https://cdn.sqhk.co/turanexode/yIrbqhh/freeciv_porta_5555.pdfIn PDF document text
    • https://cdn.sqhk.co/dopiporajen/0PBrj4M/steps_to_draw_cartoon_eyes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://netupizorazez.rf.gd/97475473607.pdfIn PDF document text
    • https://cfae799c-d04a-4395-b2c2-700dffd2ed5c.filesusr.com/ugd/15504a_94b53348f7e0479fbcad1dea639ab3ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c170768e-58c0-44ef-866f-f33c7694969b/32606501120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae311558-d510-46f9-9e85-5862770bc5d3/36733747928.pdfIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_01f0d99a4ddc4a8daa7800d9ef790a7d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/035ec461-daa1-422a-893e-eba856583ca7/bakiso.pdfIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_a4c9b65d558241049b5240874f3c97a4.pdf?index=trueIn PDF document text
    • http://xivixevowiwawe.rf.gd/51433034925.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_off0000cde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE9 5216 bytes
SHA-256: d8ab2454c0bce9a42b72df8041f6674b6f3917afc932611759b77948de160727
font_01_sfnt_off0000dfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 10136 bytes
SHA-256: 2111d4d90e8956b0da5ddcee4c8d59c77f93fe826996187c8ce483851084181b

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