Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15dd0d105550fca…

MALICIOUS

PDF

76.3 KB Created: 2020-11-18 03:56:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4dabde58e5549f643367cb21f78bc4b4 SHA-1: d836ac8b6bee0cf7f5f6f7d4068c28129dcc472e SHA-256: d15dd0d105550fca606d9cf2013900f16f6b6d4403a23bc4102b6a07ad7e2bfc
214 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 and routes users through malicious redirector infrastructure. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=keihin+cv+carb+manual In PDF document text
    • https://resodafuwagolip.weebly.com/uploads/1/3/4/3/134313475/runesijejinosujobon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392649/normal_5fa9c8a783df7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391037/normal_5fb2d874a69bd.pdfIn PDF document text
    • https://zegimobigew.weebly.com/uploads/1/3/4/3/134313375/9806477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_5f8e88e684efc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383304/normal_5f8cec2ce5a69.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/d4404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_5faa85612c765.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/303114b8-d8ac-49f6-b4f5-fe6174d8894e/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/067aa66d-1d4b-4e29-bc68-2377c67cf622/fornite_apk.com_dowload.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/660641df-aff2-4390-a69d-af08cb73db73/haynes_techbook_diesel_engine_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8d288df-e7bd-4205-bee9-51ae07fcdef8/84159684136.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/6716775606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb3102f9-ba61-42a5-ab5a-f504c2eb9646/97996161427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b6d255-9f7f-46c2-807c-c0c1315cb7b6/82061887385.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/kuxadovuxodupafagasid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67da4858-2520-4419-94f3-0133e71d320a/descargar_los_7_habitos_de_la_gente_altamente_efectiva.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010a5b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10A5B 17524 bytes
SHA-256: 47bb010dffc794a987265a705db58e4bcc2c245c2df7f37b0e663032a12134f4
font_00_sfnt_off0000d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 5032 bytes
SHA-256: 785ef7ee514d6bac2d68c2551e1f4f2ce71038c9955c0d66db01d9325cf50e35
font_01_sfnt_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 10848 bytes
SHA-256: 6716d35e448fdb70122343ad41c7cc28da2d5f622b0cfbf25cef3bb65105b475

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