Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb2b06bf1165eba…

MALICIOUS

PDF

79.2 KB Created: 2021-03-24 07:30:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5e4f5fd575a2b70d71065f7b53854763 SHA-1: 57b2a284d03893a9c24455b1a34aaf3659efed51 SHA-256: 4eb2b06bf1165ebaea2d615d5d299c5a588fc7f6a81c99f77ae852d74ab35c0f
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 0.9996

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://leonvi.ru/123?utm_term=verbal+ability+questions+with+answers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4468572/normal_60044d02295ae.pdfIn PDF document text
    • https://zapidowezagija.weebly.com/uploads/1/3/4/0/134041255/8025674.pdfIn PDF document text
    • https://zoviwifave.weebly.com/uploads/1/3/6/0/136053666/sanepaso-ledekamopa-bimawo-pisutofugisa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450242/normal_6038d851a05df.pdfIn PDF document text
    • https://mopawikivitofa.weebly.com/uploads/1/3/4/3/134347346/xuvinawofen.pdfIn PDF document text
    • https://nefadojajekewa.weebly.com/uploads/1/3/0/8/130874163/4aae3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454971/normal_604050494be58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492536/normal_602f171602ea1.pdfIn PDF document text
    • http://sulelufisumi.iblogger.org/dakesilusazevobumona.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_602de995d7a49.pdfIn PDF document text
    • https://nilijinaxobizag.weebly.com/uploads/1/3/4/3/134356504/komurar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480889/normal_605660ec2137e.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/zazepiju.pdfIn PDF document text
    • https://putonikasobex.weebly.com/uploads/1/3/1/0/131070178/3b44473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496811/normal_60258355379c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuwigugu.rf.gd/electrocardiograma_chile.pdfIn PDF document text
    • http://gizamowamuvo.epizy.com/47907471242.pdfIn PDF document text
    • http://vesevujivodekut.epizy.com/ziripejalex.pdfIn PDF document text
    • http://revifobatuge.rf.gd/angina_ludwig_adalah.pdfIn PDF document text
    • http://sawuliwinupunud.epizy.com/10553672540.pdfIn PDF document text
    • http://jibogifimot.epizy.com/conflict_resolution_definition_by_authors.pdfIn PDF document text
    • http://puzazusor.rf.gd/dojazozoz.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_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 5556 bytes
SHA-256: 646f904c93b8c43eb5a81d7538266ce99042c3f05f5feb7ca62e83f78301c58f
font_01_sfnt_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 11000 bytes
SHA-256: 42ecdb6f5b4083c701f0658b0663d4bff310da51f4869b48a677453f29467b4d

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