Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1581a3136c612d…

MALICIOUS

PDF

62.9 KB Created: 2020-11-21 06:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6a1e12fd9d176d04c153f6d33fff9bd8 SHA-1: ddf617362fdf47712fee6ec7a0d4cace1b11514a SHA-256: 6e1581a3136c612d90f663bf71566f1f837fa95f198e751958792f1e3780494c
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://traffset.ru/aws?utm_term=scrum+guide+audio PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378393/normal_5fb891336562d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5fa875bba9a1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464734/normal_5fb840e649cd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406514/normal_5fb62dd6e8709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5f8ed2a76e8da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5f8cc1dab47c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_5fabffcee4d40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476564/normal_5fb2a711406af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390641/normal_5f8e5ed44dc3b.pdfIn PDF document text
    • https://likuxosudiva.weebly.com/uploads/1/3/4/6/134603152/2686183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f87196a216f2.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/3669907c-c80c-4eda-9b16-5a3bad9bdd02/restaurant_cleaning_checklist_foh.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/quotes_about_violence_in_fahrenheit_451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e56dc2f-56ea-45d0-9da8-2394f271b5d0/rain_slickers_for_boys.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/32492656204.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F3 5152 bytes
SHA-256: 3113c38ebc18387837e64d65d5d6b2f35657f585496909070c9a7d2f75602065
font_01_sfnt_off0000ca5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5F 10716 bytes
SHA-256: 30faf01ed598759ec61b6ca12b8878145f19eae43cbb68f5e0d1e59d219cbdbd

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