Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3a60cd2c088f80…

MALICIOUS

PDF

74.4 KB Created: 2021-05-30 20:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e796cb915463618ce8a78eccfb01f89a SHA-1: 3c534a25c652eef3ec1224e468f35e919c26e50b SHA-256: 6b3a60cd2c088f80d472f8cb1c14436b57c51ef2000af9e8bd51fe1873b59273
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further indicate malicious intent, specifically flagging it as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external URLs points to a likely attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=trigonometric+ratios+worksheet+chief+sohcahtoa PDF link annotation
    • https://kajujubo.weebly.com/uploads/1/3/4/8/134864793/3170501.pdfIn PDF document text
    • https://renunuvejo.weebly.com/uploads/1/3/4/7/134710344/1197267.pdfIn PDF document text
    • https://lavulujataj.weebly.com/uploads/1/3/4/5/134576306/11384bef.pdfIn PDF document text
    • https://woliwejimagevin.weebly.com/uploads/1/3/4/3/134319070/9361539.pdfIn PDF document text
    • https://dusukipujadun.weebly.com/uploads/1/3/1/4/131437174/ritunukanijisuxiten.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/2771b210-fd12-488c-ad7a-7cb1c704525d/cooks_essentials_bread_machine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e024225-bced-4d55-b5e1-0a0e8d6129df/nulibixinema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa77d1e7-2e35-4b8b-8189-8faca05fb1a3/vedufefurat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd98247-6213-4115-b7a6-eac6fad556cb/tobukizumukumefozewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce35302-9f63-41ce-8841-19eecc21cd29/foliguvuriwutel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e49ad9ca-92a0-40d8-a14d-f28fff309e28/dexoravusejomuxeredojobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68f9721d-1a36-4b9a-98b4-15fa69c39715/suncast_hose_reel_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74347bbd-e286-403e-b362-b3ffc1ad52b0/gebosatebaduparaxaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f2fa053-ad27-4c39-9e4a-f35896fd1f22/takaki_a_different_mirror_chapter_14_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59a66d1d-2e1d-4661-8b2e-52569e80cc4b/best_daily_devotions_for_dating_couples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56e3a0dc-379b-4ae0-9d99-50b28eec7ac4/5011001779.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_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 5368 bytes
SHA-256: 5c5b05cb0359437fa4d776e54d7f2c70ecd1a3ed6bb8c1f750d11eb5135793a5
font_01_sfnt_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 11284 bytes
SHA-256: efe9cae04169fa83f3562393cde46f2bf264c0c0af38053b678ffca28a435a96

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