Malicious PDF — malware analysis report

Static analysis result for SHA-256 d723c6a84f71cacf…

MALICIOUS

PDF

63.1 KB Created: 2020-11-26 01:06:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f56642ca8e3eaf30eaab4da66e8e0773 SHA-1: dde2a9b2fa3e5f4e4baa79241a4155ad449c84e0 SHA-256: d723c6a84f71cacf3fd5dd8ffd8938b08b9cb97ce5075040544753ac5f918d37
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 0.9997

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
  • 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/123?utm_term=reykjavik+wallpaper+city+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389370/normal_5f9f59c2b5b88.pdfIn PDF document text
    • https://kutisujazuj.weebly.com/uploads/1/3/4/6/134625744/4392763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5f8b2382a7bbb.pdfIn PDF document text
    • https://bevugatumuga.weebly.com/uploads/1/3/4/3/134316863/9674279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_5f98cc68582dd.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/nefomojuwet/librenms_alert_template.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/kutovutifenufesawawi.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/bupuxupeworadesut.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/cooking_merit_badge_worksheet_bsa.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/himno_147_himnario_adventista.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/mastering_geology_lab_answers.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_off0000ada1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA1 5128 bytes
SHA-256: f409673037cf512255bc62386895085c823b3de380ab73b840404711ea70fd50
font_01_sfnt_off0000bf4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4B 9984 bytes
SHA-256: 2a77d792f56cd13aae507c16dc6c7b928e04ea2f442972e62f7991c0adceecf4
font_02_sfnt_off0000e1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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