Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3caaf2cd759f14c…

MALICIOUS

PDF

66.7 KB Created: 2020-11-25 12:15:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8603af488e0d6766363e5e9269dd0fa1 SHA-1: d887672fddbc99f74cbe72437d40d76db8bd7e9a SHA-256: c3caaf2cd759f14c6aa84b01d062f71063112deade520857db5a1bb59ba0e6ad
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://trafffe.ru/strik?utm_term=ssrs+interview+questions+for+experience PDF link annotation
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/5738851.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/698d11da-00d8-4762-8e76-1270b7d5b1e3/evaporated_cane_juice_whole_foods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda40d83-48b3-4601-8238-0731dc409e2a/mucho_ruido_y_pocas_nueces_william_shakespeare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef52d278-9095-4829-9432-9fca973a7fe7/35233068874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48bf8f19-e0ca-4a02-9039-591b6df8707d/tableau_certification_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1c1d189-e995-4f12-b45e-95985f8790d3/web_server_administration_steve_silva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65de74ad-d2d0-4854-835d-b49df1567762/my_summer_car_build_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/236c3f1c-841c-45c3-8f7e-5907baabe312/32475402615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf1b702-a16a-41ab-bd07-ba3cd2e6b2c1/othello_study_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c530774-4c2f-45f8-b792-cf0a815a5acc/26284334805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/386d3302-09f1-4ee2-962f-6b158c28a711/super_star_mario_kart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65535abf-e120-427b-b60b-863f61b036a1/29440694828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/818e64bc-9480-4682-b01e-d2332e5a0b6d/xewusobapitafubezur.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_off0000ca59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA59 5216 bytes
SHA-256: 3c2642fbdf70fbb4d2ab85244730fbcf3112a7c3ec9ed8df64e4a6863b622e20
font_01_sfnt_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 10032 bytes
SHA-256: 961e46d8a8e474cf17e6180e6f2736a28055bdcd71e951b1fc8bd4dff286150a

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