Malicious PDF — malware analysis report

Static analysis result for SHA-256 f944052e80977e0d…

MALICIOUS

PDF

74.8 KB Created: 2021-04-02 07:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 11cbe2ad1225126e29e7934aa8c16b96 SHA-1: 8025d23ec8ab1329313983c0758c478dffd96120 SHA-256: f944052e80977e0db373726c206888a4fc99d041ad721961a748fd241b5e0ea9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs, 'https://midufefew.ru/strik?utm_term=how+to+clear+a+ti+84+plus+ce+calculator', is suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=how+to+clear+a+ti+84+plus+ce+calculator PDF link annotation
    • http://gexopidikimo.mygamesonline.org/medical_english_dialogues.pdfIn PDF document text
    • http://shothard.site/xarusimemevewurusatebuvoaj1kr.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://palupalukagu.mygamesonline.org/64783363059.pdfIn PDF document text
    • http://mukinumatonewo.getenjoyment.net/51654402807.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/96ee9fce-a3f3-42aa-bd5e-70624854f3e8/soxerubelinadudatis.pdfIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_e3ae61f659cb4ed19a395a44512c6837.pdf?index=trueIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_517aa71951da4bf89a88366dcf94f097.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5daad60c-f931-4c55-976b-4090d93cc415/what_size_brisket_for_smoking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5455fb6f-5926-4e24-85ab-a64dd0bcb4a2/59437131041.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/fuwubezulewane.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/pexebejuzerejun.pdfIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_efb747dad26a4ec79e24728ad39fe0a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/fox_platform_bivvy_pegs.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/nice_guidelines_hypothermia_cardiac_arrest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe3a4694-d6b0-40be-b3ca-01d66edbb60c/9098241665.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/logical_framework_logframe_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/ikea_malaysia_catalogue_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/15022995193.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/jamman_stereo_bedienungsanleitung_deutsch.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_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 5260 bytes
SHA-256: c37afbdcabadd357f3603c2ddbbe614e8418f1fc1fcbe5914d9f2c3cafae2437
font_01_sfnt_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 12300 bytes
SHA-256: d1bfb57cb81775003387e686b18d1f59985b58b3288ec8e288d57cc97023e332

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