Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd5bd2de7b51427…

MALICIOUS

PDF

71.1 KB Created: 2020-12-20 05:44:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7035296178939cc61a78b3e96b748cb0 SHA-1: b6dca6178a9d915e3fe563cb5076ba742d370d6c SHA-256: fcd5bd2de7b51427f7fe1329a31ca44dfdf1ada04c0960ae0b6175aeef99b6e5
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://cctraff.ru/123?utm_term=drift+mania+street+outlaws+apk In PDF document text
    • https://tanutalavisa.weebly.com/uploads/1/3/4/0/134000413/f28af2218c9452c.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/zeworibuzoza/41737734735.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/89225028871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb4d3ee-1f45-4d39-ba08-dbbd820cb476/tall_white_storage_cabinets_with_shelves.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/87911095286.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/32951243874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da61a0a9-596c-4c8c-bd19-e308a41f1820/offering_memorandum_template_real_estate.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/information_about_usa_flag.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/kelixewojolonurusa.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/5282730790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9166117-ef1b-47e0-9270-525dea14231c/fuwivusimidujubor.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/41186793353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd5d2312-d970-4f4d-a840-0cbe2267d80b/66742201183.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_off0000cae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE5 5084 bytes
SHA-256: 8473da67205723a9641f8bf19d622677ea22f081f57d2da376c3418d1f18e49a
font_01_sfnt_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 11060 bytes
SHA-256: dda7e69febec605b0af3232df959911bb11a2d7ef6eebc33d8d782eb323cb567
font_02_sfnt_off00010165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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