Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5951e98172f7ed…

MALICIOUS

PDF

74.8 KB Created: 2021-04-04 03:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94a30b52ce494a4433ab0a5fca9d424f SHA-1: 936ca112e34b1c69fe03d32762916d730ddeebdc SHA-256: cb5951e98172f7edc5b93464406ef50a2eb67c2354649c46e35ed69bd45db9b0
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many of which are part of a link farm designed to manipulate search engine results, and one specific URL is presented in the document's metadata. The primary purpose appears to be directing users to potentially malicious websites, as evidenced by the PDF_SEO_LINK_FARM heuristic and the embedded URLs.

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://seumenha.ru/award?keyword=absenteeism+in+the+workplace+pdf
    • http://gukabibus.mygamesonline.org/que_es_trombosis_venosa_en_el_embarazo.pdf
    • https://towavakivuno.weebly.com/uploads/1/3/5/3/135318123/larugimufusin_porebume.pdf
    • https://kavixonew.weebly.com/uploads/1/3/4/5/134592395/natakilekajuwolexub.pdf
    • http://gixapedotamerow.mywebcommunity.org/wubuf.pdf
    • https://malabukepi.weebly.com/uploads/1/3/0/9/130969546/4802449.pdf
    • http://pelinebaj.mypressonline.com/notekuwazibulexukexum.pdf
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/2033299.pdf
    • https://gejowarog.weebly.com/uploads/1/3/2/7/132740172/vunanunop.pdf
    • http://lufexaxoxak.mygamesonline.org/armadale_train_line.pdf
    • http://samafutanub.mypressonline.com/jexinetosajibobo.pdf
    • https://vubeluzuge.weebly.com/uploads/1/3/4/3/134357782/disewesiseniwapate.pdf
    • https://gedibixofesona.weebly.com/uploads/1/3/4/6/134688069/8506117.pdf
    • http://fibiver.mygamesonline.org/32014266763.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_b6661046aeb043dbb9f34d127f3a4990.pdf?index=true
    • https://s3.amazonaws.com/filidabut/c_elegans_lab_report_brooklyn_college.pdf
    • https://s3.amazonaws.com/fupanabivote/83446123621.pdf
    • https://s3.amazonaws.com/befarekogol/43883675556.pdf
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_251266526cba4eb395b602f31a8269cf.pdf?index=true
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_f258c5e354224e39be2846da9f3344c8.pdf?index=true
    • https://s3.amazonaws.com/nijudow/imsai_arasan_23am_pulikesi_movie_moviesda.pdf
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_0e5efeb08538445e8ab6c10fb836b948.pdf?index=true
    • http://putunoxixowelo.atwebpages.com/bukhari_sharif_urdu_tarjuma.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_off0000e73a.bin
5c7617e88f6287f51b48134e9c82c81d57bf9623740f81a655d743887bf356ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 5680 bytes
font_01_sfnt_off0000fa76.bin
cf4212928ec8c3cbf09221d5cd05cd56d5b8f4def9f03312ef64dc35a625b2d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 10404 bytes

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