Malicious PDF — malware analysis report

Static analysis result for SHA-256 9322b20cf3a14a2c…

MALICIOUS

PDF

77.9 KB Created: 2021-03-22 14:02:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b1756fd052275f0aa1b174b2fe5cac95 SHA-1: 91eab9eccb7019e96fc28aa3ebd522dc6848afad SHA-256: 9322b20cf3a14a2ce451d0dfe95200bc1e1b9591535dde03e5156a5c38634a7d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to suspicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/aws?utm_term=onkyo+ht-s3700+review PDF link annotation
    • http://hookup157.fun/xotaduferovifuzivunaq3ljr.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/lg_inverter_direct_drive_washer_front_load_parts.pdfIn PDF document text
    • http://koguled.22web.org/athlete_endorsement_contract_template.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/lefujeni.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/carnival_of_venice_trombone_sheet_music.pdfIn PDF document text
    • http://tebafurunaxinuj.getenjoyment.net/23715996065.pdfIn PDF document text
    • http://harmony-market.ru/essentials_of_marketing_perreaulttqa6o.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/4781694488.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/lezugunufomum.pdfIn PDF document text
    • http://tiriburud.rf.gd/president_infinity_torrent.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/chanticleer_flowering_pear_tree_information.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/xezakumijixesufojarokuv.pdfIn PDF document text
    • http://xuposusan.epizy.com/bibliography_sample_in_apa_format.pdfIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_b3646bb1ca004d1f88869eb7b3f1aa40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/chemnitz_dictionary_android.pdfIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_7dec5e6fcddb4475bda10ce878bbb366.pdf?index=trueIn PDF document text
    • http://tasewegevatale.rf.gd/36958754938.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/form_group_checkbox_angular_6.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/is_florida_real_estate_test_hard.pdfIn PDF document text
    • http://lefivagalowo.rf.gd/chinese_ladkiyon_ke_wallpaper.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_off0000ee9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 5292 bytes
SHA-256: e1cdb7ad4736d3457d60b5c823a0f80a57e5e2e9b2a7991e5b6e2ff2194b7112
font_01_sfnt_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 11940 bytes
SHA-256: 2815490c4f35081cff0e92ab379e015c2e941ef96d89f65bd1027bb12449b4ef

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