Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb793f5d811c352…

MALICIOUS

PDF

79.6 KB Created: 2021-03-25 14:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2dc3018bbcfa21f4f3a43a630bd5682a SHA-1: 9bb61ce4044120fea7cf5a6ad1d927fe5daa028e SHA-256: dbb793f5d811c3526925bfa900b9785d248ecbe39ee5ef13cdfa68af8dd2b53d
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://leonvi.ru/award?keyword=alleluia+mozart+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448746/normal_5fcae741c6d2f.pdfIn PDF document text
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/1925111.pdfIn PDF document text
    • https://puziwifatewir.weebly.com/uploads/1/3/4/7/134715637/gizafogemobuvidi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_603d3110b86ee.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/oggcKib/gazanudopogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376126/normal_5fd7f6906620f.pdfIn PDF document text
    • https://cdn.sqhk.co/vezubusevof/84hcSDV/ansible_template_create_parent_directory.pdfIn PDF document text
    • https://vasejafarobi.weebly.com/uploads/1/3/1/4/131454155/6988621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484632/normal_5fd36c5d375b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_5fd322fa4c3d2.pdfIn PDF document text
    • https://tofexozulemun.weebly.com/uploads/1/3/0/9/130969243/somekikuzupuse_rarox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453907/normal_5fd2c4cb571c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484609/normal_5ff4fcf9b9b25.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/jadudusujuje/pelunitemadafezolu.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_b8a6658762224cbfbb52d48ce375cb63.pdf?index=trueIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_6b157f8e5ca44cac81baf49accb48dba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/numunenoji/the_very_busy_spider_activities_tes.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_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 4824 bytes
SHA-256: 47067db710f8099f174664b5e805d37bdefb5cd5fb1687bfe672f51278c55bd9
font_01_sfnt_off0000f1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 16208 bytes
SHA-256: d2b5151fe9442d5eb1fbf907f72aab43548d9c362d8e4ae53b537b49076766da
font_02_sfnt_off00012349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12349 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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