Malicious PDF — malware analysis report

Static analysis result for SHA-256 578c66def6ae96e4…

MALICIOUS

PDF

78.8 KB Created: 2021-05-29 00:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4d52003b127c44a34898ed8bbe454883 SHA-1: d8ff8acc8959405e2826dcb4dcdd1b0daa1533c2 SHA-256: 578c66def6ae96e4f2030140872657a586577a3b3e002be1d5f16ca339ad6467
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/123?utm_term=tomcat+application+server++windows PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413016/normal_6038437a93aa1.pdfIn PDF document text
    • https://jegivobepumo.weebly.com/uploads/1/3/4/4/134444156/remobezir_miwalejitekaju_xevogidarawi_judevenovud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383687/normal_602eb326453b3.pdfIn PDF document text
    • https://toxerixefekivi.weebly.com/uploads/1/3/5/2/135296371/gumuxugej.pdfIn PDF document text
    • https://nitevafatuva.weebly.com/uploads/1/3/4/8/134872456/wesavasinexomibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462037/normal_604aec8057508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459029/normal_606e644c1a116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_604a023066252.pdfIn PDF document text
    • https://wepoduxusuduxi.weebly.com/uploads/1/3/4/3/134306179/4dbc5b7f4782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448129/normal_601ab2deed8c4.pdfIn PDF document text
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/23bbc546f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416494/normal_6035e89f6808c.pdfIn PDF document text
    • https://xokubimekitogi.weebly.com/uploads/1/3/5/9/135986234/mibediseridi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477623/normal_5fd8bfd74a7a7.pdfIn PDF document text
    • https://bowepatajipama.weebly.com/uploads/1/3/1/4/131438296/677c50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_6063053c01cd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5fe637689a9f8.pdfIn PDF document text
    • https://gerudupox.weebly.com/uploads/1/3/2/7/132712596/1624423.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
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EE 5108 bytes
SHA-256: 69f10a214c7ea8b90ee91352b25d80f7a2c4413a85a24dd43b4f4a522be8c49b
font_01_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 10920 bytes
SHA-256: c0870871fa3feda474a16a88eeb0218bb4fa5ca15eec623f027fffdd83098f61
font_02_sfnt_off00011e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E76 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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