Malicious PDF — malware analysis report

Static analysis result for SHA-256 062a664a820f3617…

MALICIOUS

PDF

73.9 KB Created: 2021-02-12 06:14:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5beea1d0ed3f0a3fa638b324cb154b41 SHA-1: d1143adfb1d6c792db62a3474bcf1221cf67512c SHA-256: 062a664a820f3617eb5029834a63f3a7643dc0c1053b6dc680c8fa7ac345ef85
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/123?utm_term=chromatin+condenses+into+chromosomes+as+the+nuclear+envelope+disappears+during PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450907/normal_5fd175760085d.pdfIn PDF document text
    • https://jifilebipik.weebly.com/uploads/1/3/4/3/134375607/nuxojakidakafes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366367/normal_6000bbe6c35b9.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/edafbec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369907/normal_5fce2962001e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489843/normal_6000cbfc0803f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391636/normal_600271fb4915d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485587/normal_600ab9b9ee189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475716/normal_5fdb750c2cb17.pdfIn PDF document text
    • https://peniseguj.weebly.com/uploads/1/3/2/7/132712198/zikadozizapuvebo.pdfIn PDF document text
    • http://fojibewuf.iblogger.org/kindergarten_phonics_worksheets_free.pdfIn PDF document text
    • https://tedejewudokas.weebly.com/uploads/1/3/1/0/131070167/4591656.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nadiripu.epizy.com/63057026814.pdfIn PDF document text
    • http://jadefixadejin.rf.gd/70970890356.pdfIn PDF document text
    • http://bamasagure.epizy.com/georgia_mandated_reporter_statute.pdfIn PDF document text
    • http://gonefuxirazu.rf.gd/77476420503.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_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 5452 bytes
SHA-256: 445da1076815294939c58037b49d003a30c578907638665682c14c94635e0532
font_01_sfnt_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 9904 bytes
SHA-256: ea418b261ff991e9a71ced1fcb58616d636d35964566ae18006848541b9f4b16

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