Malicious PDF — malware analysis report

Static analysis result for SHA-256 861be620fb55f6db…

MALICIOUS

PDF

73.2 KB Created: 2020-11-27 04:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fc6b0c3d4922bd85468351f645f5cdff SHA-1: dbdd640245ad1c8bd0ae00cc3a053ea97b319b9f SHA-256: 861be620fb55f6db4676a210d0ff7699f73ab97afcb3560601103efcacb2ac72
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 0.9997

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://trafffi.ru/123?utm_term=nivea+soft+moisturizing+creme+ingredients PDF link annotation
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/jetoge-jarazesizu-zekivep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5fa1c636c846e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423155/normal_5fb02e67bacb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453914/normal_5fa242e47ba86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5f89c1a8c4117.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/webuligavedike.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5521a663-f7f5-427f-9776-d72f4d072d50/59089247747.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/53918226193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c452e630-7034-4734-a4a1-dc4a56cddf5f/ir_spectroscopy_practice_problems_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d951761-0651-450d-864c-92ad6b5d731f/xomomikexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e34def66-6136-44a2-963d-552a9670070b/21st_century_skills_rethinking_how_s.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/validity_and_reliability.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ca5234-157e-4d06-bff9-089142a16685/jugilali.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F1 5268 bytes
SHA-256: 1d75f85aba9d4b293d1079ba93a758603a179a6d75de91ef55313b87fa0e3a20
font_01_sfnt_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 11400 bytes
SHA-256: a7c227c1a53b51e775b85c4f5a921a158303081f46d874c599e5cfd43ddbc8ec
font_02_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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