Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc196dba57f4c7cf…

MALICIOUS

PDF

79.1 KB Created: 2021-03-02 21:15:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 54a512b3c8c5f8b4150de0a7f97e44a4 SHA-1: 9bf42344592e91cc49d4b282ff83d59f8b1a0bf3 SHA-256: bc196dba57f4c7cf072d6d963e5781a45e44e5cd8ffd7a7b6e872681dc66856b
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://vilenefex.ru/strik?utm_term=the+production+of+space+lefebvre+pdf PDF link annotation
    • https://lajidusok.weebly.com/uploads/1/3/1/0/131070852/1350170.pdfIn PDF document text
    • https://lofofofudu.weebly.com/uploads/1/3/4/6/134621951/nuzilerima-nelekotabebidat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413697/normal_5fd2603c81d64.pdfIn PDF document text
    • https://sozatoma.weebly.com/uploads/1/3/4/4/134484551/lazabekobejomabikub.pdfIn PDF document text
    • https://lobixeximoruse.weebly.com/uploads/1/3/5/3/135319822/62ee620.pdfIn PDF document text
    • https://nokaxogu.weebly.com/uploads/1/3/4/5/134520383/zagibamukaxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450347/normal_5ff2995b3c28b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463286/normal_5fe0f5ccb5e91.pdfIn PDF document text
    • https://jisuxewaxem.weebly.com/uploads/1/3/1/8/131857679/642617.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/umrah_guide_booklet.pdfIn PDF document text
    • https://xovisifolato.weebly.com/uploads/1/3/0/8/130814526/kovafovegipav_mexuviwibopomi_mapuroparivogoj.pdfIn PDF document text
    • http://pasikufopubiwo.mypressonline.com/65256679710.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374189/normal_5fcdeb5984bde.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/bimukoraxedok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454436/normal_5fd0a5dd35252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_601faa9044616.pdfIn PDF document text
    • https://xuniruki.weebly.com/uploads/1/3/0/7/130739043/d60a09ef2c9a40d.pdfIn PDF document text
    • https://pobozopidukav.weebly.com/uploads/1/3/4/3/134384736/gijijefadewipi-damusipofafi-sikit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bogalibamadom.myartsonline.com/xelozobibidokifegubuzav.pdfIn PDF document text
    • http://mukanebesiva.atwebpages.com/jamelazawogofuzogakiji.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_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 5392 bytes
SHA-256: 78d008fb907b98d454e4ed63b2b77fe3daa7e11c6571082b66f7abca4e94e071
font_01_sfnt_off00010b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B82 10560 bytes
SHA-256: 5ce9425d699029656d748f48a1d8918073e85f5b013ed061f2e10bf340d44130

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