Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7eca0c058aa942…

MALICIOUS

PDF

76.6 KB Created: 2021-05-22 22:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 344f973f1885fa5fdc78ee30d37e1139 SHA-1: 562b5690ce200a510f6492ac8627f9bfc693c8d4 SHA-256: 4f7eca0c058aa942d8e4fbe1bf0b62c7ebadad7453ab0062ffa33800935aae85
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://botokaw.ru/strik?utm_term=oxford+discover+1+student+book+pdf+download', indicates a lure related to educational materials. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution attempt.

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://botokaw.ru/strik?utm_term=oxford+discover+1+student+book+pdf+download PDF link annotation
    • https://xajimago.weebly.com/uploads/1/3/0/8/130813364/2679106.pdfIn PDF document text
    • https://nutagabe.weebly.com/uploads/1/3/5/3/135325028/b2ecd314c32503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445879/normal_5fd1eeced8818.pdfIn PDF document text
    • https://nemoderi.weebly.com/uploads/1/3/2/3/132302766/jurejuluza.pdfIn PDF document text
    • https://diwamelebo.weebly.com/uploads/1/3/4/1/134108813/nasixi-baledalanigewod-denenigodozikuj-vokovo.pdfIn PDF document text
    • https://bogigevaruzo.weebly.com/uploads/1/3/4/4/134435623/1658637.pdfIn PDF document text
    • https://zupavuzinopaz.weebly.com/uploads/1/3/4/2/134265708/3881948.pdfIn PDF document text
    • https://jifefovemerozix.weebly.com/uploads/1/3/4/4/134444698/kanijelelava.pdfIn PDF document text
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/ffa2277ef.pdfIn PDF document text
    • https://gugivubur.weebly.com/uploads/1/3/4/3/134390132/riberovatunuj.pdfIn PDF document text
    • https://gutinevar.weebly.com/uploads/1/3/4/6/134611255/7033907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_60358692a45b8.pdfIn PDF document text
    • https://vatovuturok.weebly.com/uploads/1/3/1/8/131856009/movaxaxibupiwi-tidokobifunud-joraja-kamatuvoxipep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_60476427e34a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/47696b09-6352-4126-a894-0c83cf527a9e/45608597603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7713a23-acb5-4e6c-a6af-a4c989948329/gnosis_bible_verse.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/guidecraft_dress_up.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/92041957541.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_off0000e28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 5652 bytes
SHA-256: 4983be774d06aa612043ed1e16ba11d106448ea68269bd7b14f105e65b412a77
font_01_sfnt_off0000f5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 17236 bytes
SHA-256: 5757dba480f2609200039e75585f91cb7136db6b07a3b6e7a561c8b210025d73

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