Malicious PDF — malware analysis report

Static analysis result for SHA-256 8898e357e3e4a92f…

MALICIOUS

PDF

77.9 KB Created: 2021-04-03 23:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 19c48341c02f350b1df784d3fea6ccc8 SHA-1: d9b5935fef6c26f643c6d76831e3be9534d55985 SHA-256: 8898e357e3e4a92fdcd19dae33045dd0e45264ad30407063ebf82aafea40af8d
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 0.9998

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 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://resalured.ru/aws?utm_term=how+to+do+a+fashion+technical+drawing PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448750/normal_5ffb858d5cfab.pdfIn PDF document text
    • https://cdn.sqhk.co/badalozebale/hfbhhjc/45717620356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481993/normal_6028718a2953b.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/69982409974.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobuwaxegu/hfbjdb6/hungry_shark_adventures_3d_mod_apk_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/1QFzjbO/kaxabawabeduwobotasovuwix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404976/normal_5fca4baa4bb95.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/bgdgegf/koderma_pin_code.pdfIn PDF document text
    • https://cdn.sqhk.co/gukijenof/icfjdiG/best_automatic_photo_background_changer_app.pdfIn PDF document text
    • http://riwalimuj.scienceontheweb.net/cdc_pediatric_immunization_schedule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_50caee337edf45a88fa188cce3a4bfef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nonabafat/96456794616.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_c18347d9f91149a589cd6ef565ed668c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dalava/bill_of_sale_michigan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/hoi4_japan_guide_1._6.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/rabov.pdfIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_f22ec461476a433aaeebe9aff15bb928.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/cancer_research_logo.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/how_to_program_my_liftmaster_remote_control.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_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 5336 bytes
SHA-256: c6fdca7dcfca780623c54fbdc343cad16f3db9d6085f34c3651c6209ef0f7187
font_01_sfnt_off000105c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C4 10748 bytes
SHA-256: ac86e4e1d03622c968651924cb03399bd7f448625c459eaa44fe5b6594269fd6

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