Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d358a360adaa606…

MALICIOUS

PDF

73.7 KB Created: 2020-12-28 05:37:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d176c4dbec8c3840cf003f1e59ea83cc SHA-1: d4a45b7bedef13d386496512f25cf30d22bd9176 SHA-256: 2d358a360adaa6069ca01f7898c92e1b2821a58a4790ff6eb059c9483a5bd87a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF documents hosted on various platforms, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to potentially harmful content or exploit vulnerabilities.

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://traffine.ru/aws?utm_term=making+inferences+worksheet+1 PDF link annotation
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/dawup-dufoka.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/9031774.pdfIn PDF document text
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/wamaf.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://s3.amazonaws.com/zikeko/ring_of_invisibility_minecraft.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/7823962466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6994c44-e766-49c9-808a-b67533ee245d/36803193403.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/car_driving_games_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/citizen_eco_drive_wr200_navihawk_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a37d8f-c5d7-4b79-92ce-08416dcfa5b1/citizen_gn_4_s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5023ec0-ed0e-4e7d-8158-170947755695/kexokozozawefameni.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/chbc_news_reporters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98792f9e-361c-43f9-8f45-cc210ce5bf27/wuweridugu.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_off0000d87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 5112 bytes
SHA-256: 79c78746d5e2f7e6c7588f8f2716e356c7ca315e5d6239f96fadecdaf0a09135
font_01_sfnt_off0000e9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 10016 bytes
SHA-256: e760339cc6f6f346cf056616ed42d582dc506c98094a314ab72bf01dcf275111
font_02_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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