Malicious PDF — malware analysis report

Static analysis result for SHA-256 95339a11eb31be5b…

MALICIOUS

PDF

75.6 KB Created: 2021-06-01 02:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 67f673999601b18d494dcb2847c4973b SHA-1: 5075d0452d66dc3cb4783236e8f13d0867267768 SHA-256: 95339a11eb31be5bbaae8f7732ff92482db737d21c3e8b472d3fc5d85cc0fee6
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDF documents hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute malware or facilitate phishing. The presence of a 'download' button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/123?utm_term=present+simple+affirmative+exercises+pdf+elementary PDF link annotation
    • https://nupanirosum.weebly.com/uploads/1/3/4/8/134858368/6ebe117a3755ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_60567b8fc48f6.pdfIn PDF document text
    • https://xadixifiv.weebly.com/uploads/1/3/4/8/134888816/16d0af348170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469374/normal_600afb0c9cee7.pdfIn PDF document text
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/nipubukiwatare-zavakuzuponor-naributediv.pdfIn PDF document text
    • https://vizavidonase.weebly.com/uploads/1/3/4/0/134040461/vapikafe-wapoxitire-nejebelogu.pdfIn PDF document text
    • https://dodivimibo.weebly.com/uploads/1/3/4/3/134305777/tamirujik-xegaleva-sikubotev.pdfIn PDF document text
    • https://mimoleratamofip.weebly.com/uploads/1/3/4/5/134500060/wudupesepuk-puvilogal.pdfIn PDF document text
    • https://lasuresupaka.weebly.com/uploads/1/3/2/6/132683400/6416609.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/2158304.pdfIn PDF document text
    • https://gexemuxu.weebly.com/uploads/1/3/5/3/135394015/sogukojezoneb-xegiv-rizogowes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482228/normal_6069d3d4c28c5.pdfIn PDF document text
    • https://wutefojatix.weebly.com/uploads/1/3/4/6/134662353/524c05df8158.pdfIn PDF document text
    • https://wazijewafaset.weebly.com/uploads/1/3/4/4/134437152/zelek_fujazivulo.pdfIn PDF document text
    • https://vakexojukesazi.weebly.com/uploads/1/3/0/9/130969985/5741968.pdfIn PDF document text
    • https://funiduned.weebly.com/uploads/1/3/4/7/134773133/nanot_nuxunow.pdfIn PDF document text
    • https://guxozagubixox.weebly.com/uploads/1/3/1/4/131437827/fepuzar.pdfIn PDF document text
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/11efc3901781809.pdfIn PDF document text
    • https://rozuguki.weebly.com/uploads/1/3/0/7/130775318/tozulifezil_pipeludiji.pdfIn PDF document text
    • https://bubemufebe.weebly.com/uploads/1/3/4/4/134470009/6965265.pdfIn PDF document text
    • https://xojowikenokux.weebly.com/uploads/1/3/4/7/134706662/6251022.pdfIn PDF document text
    • https://rekinijibir.weebly.com/uploads/1/3/2/3/132302710/3def6cbc431f.pdfIn PDF document text
    • https://rixidagetowema.weebly.com/uploads/1/3/4/6/134612143/4ed668c.pdfIn PDF document text
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/26088a6aed22f9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 5532 bytes
SHA-256: b4d4566444fb601df65d13d59f83a225aa769ca66ccc3116d0d2b63ff90c313d
font_01_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 10968 bytes
SHA-256: fb59dbe337071bd1e6fcd2f16aaafd964255955a9dd3d89cd49c60648de8afb3

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