Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4a65ccc6d0fbda…

MALICIOUS

PDF

83.4 KB Created: 2021-01-28 10:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 60774d8bfa84e70a0875804f44090243 SHA-1: 169d540b93824e7473d2a70d46c559cc4eeb10dd SHA-256: cd4a65ccc6d0fbda9ae9e4f84eea9477adb131f073da8186c6adbe1fab93bf5f
186 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 0.9998

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/aws?utm_term=facebook+for+macbook+air+free PDF link annotation
    • https://zevixaxilifudex.weebly.com/uploads/1/3/4/1/134131629/sakulasobamizu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373998/normal_5fc6982b34faf.pdfIn PDF document text
    • https://cdn.sqhk.co/wapadofiwe/jrhhggi/69167554144.pdfIn PDF document text
    • https://cdn.sqhk.co/rasufizo/LXjbrie/85318164959.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454281/normal_5fde0d75291aa.pdfIn PDF document text
    • http://womenalikumat.22web.org/hackintosh_zone_sierra_install_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/fomezawelud/0hfvic6/tufixebazonimeva.pdfIn PDF document text
    • http://madusotiju.22web.org/28424566084.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466146/normal_5fc6018a94920.pdfIn PDF document text
    • http://potobol.22web.org/joruxikegixuzenigaxuvu.pdfIn PDF document text
    • https://vidokabotofasi.weebly.com/uploads/1/3/4/8/134868814/b50e5d9b8e24e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369626/normal_5ff1b431d4384.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/jfhggje/safebuvevasikati.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/ijThhcg/rugagugegilobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kevusej.epizy.com/stock_market_investing_guide_for_beginners.pdfIn PDF document text
    • http://febiked.rf.gd/apache_directory_studio_linux.pdfIn PDF document text
    • http://nefaped.epizy.com/94811621141.pdfIn PDF document text
    • http://lanakupi.epizy.com/gopuwoguxeronokamoxowo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001150d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1150D 24324 bytes
SHA-256: 79b7b92812cf5ecff6c41ce819ab086779c076b6a20ab5a5659a7704880ac0b9
font_00_sfnt_off0000da32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA32 4976 bytes
SHA-256: 518b1961f7c32a986d393f8ec5a28592bfef27c75fe5b95cc45f827aaca2a19b
font_01_sfnt_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 14808 bytes
SHA-256: f9f19359ab1068ac51cd52b79d324b47d51309f04f3eada1f76420078a363397

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