Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec9da9b51e45618…

MALICIOUS

PDF

79.4 KB Created: 2020-11-21 08:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 9fdc58b134ca2145494ad650d4942caf SHA-1: 762a81ac18e7c36cd5c0115bf807b70e7a70ace6 SHA-256: eec9da9b51e4561859db9ecfab9fbdfdace7bf4a82b1f8c25d0de50221e39ae3
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 0.9996

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/123?utm_term=is+73+a+prime+no PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443824/normal_5fa52823eb140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_5fae6e4fd6ed2.pdfIn PDF document text
    • https://voteriboxovoviv.weebly.com/uploads/1/3/4/3/134352377/zodupexedisalikukiri.pdfIn PDF document text
    • https://fimozovaxevaba.weebly.com/uploads/1/3/4/3/134366914/8510576.pdfIn PDF document text
    • https://lejigatoni.weebly.com/uploads/1/3/1/8/131871980/ruwubexopadoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470209/normal_5fb47f67ed8cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412909/normal_5fb8a4deb54af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462697/normal_5fafd758b6793.pdfIn PDF document text
    • https://pusemekit.weebly.com/uploads/1/3/4/6/134680760/logavumiwi_guxekasikej_wiwokebuzasima.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/fajonubinomeder/autobiography_sample_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0305a37e-6634-4e7d-b5cf-8f47660ea239/tadedarejal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ea73a2-88f4-4f2a-9d95-bf4c51e0da6a/81206699086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feefe39c-a1fe-4768-abe0-13e7f14f17ff/30117006434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8b931fc-6675-4b0e-a6a7-94d9c5a34a52/waturaleteworuze.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010528.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10528 18060 bytes
SHA-256: 5aedd0227c26c5b72ca67aec62e7ec80cb76b71001c60d854041012f5207ecca
font_00_sfnt_off0000cf5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5F 4824 bytes
SHA-256: 355805ec4b74822201d5412b4b2762a7ca6a61a7b212d1410943869e3c4bca25
font_01_sfnt_off0000df92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 11160 bytes
SHA-256: 0aa148e31eee5d6b2af648da7dd006d087fb706ba1905aeeed7fa93f0a072b7c
font_03_sfnt_off00012102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12102 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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