Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03715ebe5edd4dd…

MALICIOUS

PDF

70.0 KB Created: 2020-12-16 09:28:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a87c6ae1488f03a7dca4ad20ffdea011 SHA-1: 96c089b54823baa1ecdf25bd5ab8c016e51e95fc SHA-256: f03715ebe5edd4dd625a0eaa89c293140b246386bdd7196f965a282b8bace2b5
222 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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/123?utm_term=moviebox+apk+free+download In PDF document text
    • https://polirafula.weebly.com/uploads/1/3/4/5/134528493/dcae7f65b6385.pdfIn PDF document text
    • https://keminozabigorez.weebly.com/uploads/1/3/4/8/134886120/kaberukim.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/zedudo/musebekuritodiwoxipununu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a0665a5-288a-46d2-8011-8725a63edbb4/xamipiva.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/wudujolusinovax.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/ashrae_handbook_fundamentals_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5973bc6229360eccccca1/t/5fc8d1d7ec83506b04836e2a/1606996441722/79089441955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd421d6-c743-4051-af37-6ef4f69dea8a/plano_senior_high_school_transcript.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/873687d0-6259-4538-b8e4-740a858704e4/craftsman_door_opener_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/microsoft_address_book_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/yo_kai_watch_3_joker_whisper.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_off0000c7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A2 4996 bytes
SHA-256: 34e0f88d2465a22bfec7c87010957e4617f22f5dec145702f0d0b132f9949351
font_01_sfnt_off0000d8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 10836 bytes
SHA-256: 09dbd3444d8b296f593c25aeb655ace1762901615fa4c1653737693119dce871
font_02_sfnt_off0000fda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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