Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc72e8ec8fe24e26…

MALICIOUS

PDF

75.7 KB Created: 2021-03-30 08:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b4e01fd6417ce24bcedab48fbb9110e9 SHA-1: 5a1e3ce12681fd4c4e39c32330aa5a78ad49c287 SHA-256: dc72e8ec8fe24e260a8470d8c0d58e64341e13ffb2077b65617787806411842b
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 0.9999

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://dugedepap.ru/123?utm_term=coco+movie+questions+and+answers+in+spanish PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459054/normal_6006208696759.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409610/normal_6009aa3d19a3c.pdfIn PDF document text
    • https://darojavanobize.weebly.com/uploads/1/3/4/8/134889586/3494097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481067/normal_605071b2b35e4.pdfIn PDF document text
    • https://ziwodenitisal.weebly.com/uploads/1/3/4/3/134350364/reniw_dumisasimuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_601b35ad27ddd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471109/normal_5fcf04239c000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fidazel.epizy.com/jp_morgan_long_term_capital_market_assumptions_2017.pdfIn PDF document text
    • http://kojexeruxub.epizy.com/ley_4_2017_canarias_noticias_juridicas.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/zokajodititipunu.pdfIn PDF document text
    • https://b6e49935-6d58-4bde-831f-6e0b746776d3.filesusr.com/ugd/7d321f_143daf42000e40b3ad82bfa516d6f23d.pdf?index=trueIn PDF document text
    • https://0bc2ebcf-5b85-435c-8290-6c6350a165f2.filesusr.com/ugd/ee98f5_5750489a3af04271883821400b75a2d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/how_long_to_learn_computer_programming.pdfIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_756cb18d3e3c4c188e7ea031a3515b71.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_6d557ca08f9c43aaa34dee79957e35eb.pdf?index=trueIn PDF document text
    • http://vutuzepen.epizy.com/wusiwiliwosojaridan.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 5464 bytes
SHA-256: d06d018197916231d110b7cfc109c0425bf4ba0309299249a3deebdccf62f009
font_01_sfnt_off0000fbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 10620 bytes
SHA-256: e93473eeaf68c52c3785634b74e8208a5430f99a9f7e07216708aa5cbb32b829

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