Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf70ea3a8b5adeb…

MALICIOUS

PDF

77.1 KB Created: 2021-05-18 09:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30fb3eb3a10ae4aecb863a05ef6eff27 SHA-1: 14a1a5055566ba964fac9eb289da753ddaf00f84 SHA-256: bdf70ea3a8b5adebb240912ce797e24cbbc2946c49a57cc4272fd78ea700a5a8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or distribute further malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or content-farming attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=bible+reading+plans
    • http://tizipiwo.22web.org/18694272891.pdf
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/kozusegev.pdf
    • https://xikofekukinakij.weebly.com/uploads/1/3/2/6/132681309/4582661.pdf
    • https://kubegagalinono.weebly.com/uploads/1/3/4/7/134714436/45b0e227e0.pdf
    • https://cdn-cms.f-static.net/uploads/4476294/normal_600bbd6956df2.pdf
    • https://rozelofesewezu.weebly.com/uploads/1/3/4/0/134040375/redadurupafugurerig.pdf
    • https://favexolifuluk.weebly.com/uploads/1/3/6/0/136092880/lemimowi.pdf
    • https://gaditefu.weebly.com/uploads/1/3/2/7/132712385/niribizo.pdf
    • https://kaxuzemerufo.weebly.com/uploads/1/3/0/7/130775382/8637091.pdf
    • https://cdn-cms.f-static.net/uploads/4374178/normal_6036e1ede100c.pdf
    • https://static.s123-cdn-static.com/uploads/4408333/normal_5ff04bce2dc93.pdf
    • https://rebodegumirimak.weebly.com/uploads/1/3/0/7/130775130/xikeviwo-pezozepep-kidutupume-nalifunamat.pdf
    • https://static.s123-cdn-static.com/uploads/4491157/normal_5ff22bd353a16.pdf
    • https://gitufigekuxos.weebly.com/uploads/1/3/4/6/134634758/derarepa_fanifav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tinajabizoreguf/aubrey_maturin_audiobook.pdf
    • https://s3.amazonaws.com/vinejivunitego/fingerstyle_tabs_free.pdf
    • http://xegeduv.rf.gd/a_course_on_elementary_probability_theory.pdf
    • http://ruxurosagogaru.epizy.com/zanivoziz.pdf
    • https://s3.amazonaws.com/zobuwubedak/rca_dvd_home_theater_system_setup.pdf
    • https://s3.amazonaws.com/bubeto/vonebizimiseb.pdf
    • https://s3.amazonaws.com/numegubowalonan/73252387701.pdf
    • https://s3.amazonaws.com/wowonesoribu/73042532693.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f133.bin
7ece0337717f42ee95c72268c11b1a6f03c6a1f69b09920920c58ba055e59575		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 5316 bytes
font_01_sfnt_off00010349.bin
510598872dfca4d79dc5f8b3646d9621a4a66e908a1a1af08081a3a7392e4a02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 10680 bytes

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