Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c622f0d91eb7a43…

MALICIOUS

PDF

49.5 KB Created: 2020-11-07 21:54:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 25c84d33ce4b1931a1724f472692aa0a SHA-1: 882d5427f1bcd954b986dab0d9cedb0881c3c5c0 SHA-256: 5c622f0d91eb7a431ad5a6253a6b4d5f5840cea4ad45bdabb4b7b7923730d4e2
66 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a link farm, a common technique for distributing malicious content or phishing. The ML classifier strongly indicated maliciousness, and the document body, though malformed, contains references to the malicious URL. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?keyword=to+kill+a+mockingbird+chapter+16-17+summary PDF link annotation
    • https://detopeda.weebly.com/uploads/1/3/4/3/134305225/6d69d63d.pdfIn PDF document text
    • https://pusasosabuni.weebly.com/uploads/1/3/4/6/134654602/nidarobaniwa-judedepumuj-kozidej.pdfIn PDF document text
    • https://nirotobilimob.weebly.com/uploads/1/3/4/4/134484477/zuwesoganumotidepab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_5f96f6e65a204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387233/normal_5fa5068adc411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411686/normal_5f95f324d0baf.pdfIn PDF document text
    • https://defelidiko.weebly.com/uploads/1/3/1/0/131070982/lufeke_zazaxiruka_xawemixogavasob_vujipukapavuviz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5f928b9b5531b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5f9165ecadab4.pdfIn PDF document text
    • https://govumubi.weebly.com/uploads/1/3/4/3/134349805/punujifemobekokurani.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/3c98a51e-5dd6-4e46-adbf-621426fdceac/71912624397.pdfIn PDF document text
    • https://sosuvoxis.files.wordpress.com/2020/11/sirabelopazasi.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/65786282377.pdfIn PDF document text
    • https://s3.amazonaws.com/juxatop/85410477737.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/67049588743.pdfIn PDF document text
    • https://vumasut.files.wordpress.com/2020/11/3100179274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd299566-3b70-4819-a665-157501704357/d_d_heroes.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_off000081f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81F2 6060 bytes
SHA-256: ee9f7a1b3dc77e6062b4d5443073c500eb5ff771e81c6eb7044736a174e1dc4e
font_01_sfnt_off00009676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9676 9996 bytes
SHA-256: e30abca178f48f88e91460ba0d096a990bd86607356166c4139a24445b27c4c7

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