Malicious PDF — malware analysis report

Static analysis result for SHA-256 491d50c263df14a5…

MALICIOUS

PDF

68.4 KB Created: 2020-11-20 11:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a78ec95e3c9f13362127b9357ac8ffc1 SHA-1: d30ff23e26f2e8fac86b6690d0dc7360b70ae89e SHA-256: 491d50c263df14a5d4fcb49ce753d6c78842f4d5c8a706b5546b326054e091f5
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/strik?utm_term=apple+family+sharing PDF link annotation
    • https://latujajadaf.weebly.com/uploads/1/3/4/5/134593938/3834219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5f929dee68f49.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/f5d445.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/26a01566423485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387046/normal_5f8eb106bbb92.pdfIn PDF document text
    • https://vovinusowoxojik.weebly.com/uploads/1/3/4/3/134349833/jijexipofokupil.pdfIn PDF document text
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/5f8005a965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379723/normal_5fa6cf3e901fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8a840b1-2624-4179-a80d-57bd4ad10edc/20861129640.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/tss_book_architecture_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/selukepepiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/anxiety_definition_journal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9737f07-34ad-42bf-815f-5229cb3a29ba/deacon_training_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/bl_kapoor_hospital_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/xawotevanodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd4634f-8a59-4834-9240-8e1c0589fc2d/harry_potter_lanetli_ocuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae4a208-729a-4eb8-ba32-3a2c4bc7a819/7.3.2.4_lab_answers.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_off0000ccb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB8 5408 bytes
SHA-256: 89e5703e59c903762cdaec5b706dbb152025804de69dec15945ea0ff6a53e25d
font_01_sfnt_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 11264 bytes
SHA-256: a2c731711fb19a263b3b32d2090a43111a7297fc03354de9de8c6e20581c6228

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