Malicious PDF — malware analysis report

Static analysis result for SHA-256 324f264f27ca589c…

MALICIOUS

PDF

64.6 KB Created: 2021-05-04 07:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1f0607e231c86a63780d7d32c2720c05 SHA-1: f82aa501eb174368fe9f62dc783c2b1cf8280bba SHA-256: 324f264f27ca589c7eca87a503bfe9fcf7cfa1fe9e0b3410c88f296129b1ea81
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of a URL with a 'utm_term' parameter further supports the idea of a phishing or redirection scheme.

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://gimoguvi.ru/strik?utm_term=highway+safety+manual+training PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471106/normal_6003db6f7a668.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385230/normal_5ffad6fb8240a.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/jfi6Zif/4299752323.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/tmifRUA/76929576930.pdfIn PDF document text
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/zekel.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/4kAjgjd/96665304294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421788/normal_6032e6976824d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5fd297252d202.pdfIn PDF document text
    • https://cdn.sqhk.co/josedinis/ihRheN3/tilixaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485828/normal_60497cf6e9aff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_604492697dc5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489414/normal_5fcf5e1201215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413697/normal_603861728e571.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422134/normal_60089b02aa14d.pdfIn PDF document text
    • https://donabetolemi.weebly.com/uploads/1/3/1/6/131637402/efcd6f8ad3d4d94.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvotalek/O2jeaK1/92372964698.pdfIn PDF document text
    • https://bamukafigozoxin.weebly.com/uploads/1/3/4/8/134861202/zixirawaxumop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wobadumiravolu.atwebpages.com/80506362406.pdfIn PDF document text
    • http://novogizeboje.myartsonline.com/toefl_sample_test_with_answers.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC157 5336 bytes
SHA-256: dcfca65aaf8fda0f55288e79d21bffd68cdc71e087a27ab9aba7d967ddd1289e
font_01_sfnt_off0000d36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36D 9876 bytes
SHA-256: 357782c50d804345f58189c9f69928fa4930159244fb947ea97523ea67b4dfe1

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