Malicious PDF — malware analysis report

Static analysis result for SHA-256 535035995b1b61c4…

MALICIOUS

PDF

81.8 KB Created: 2021-03-18 00:33:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 89d6d1603a10982089e1786fd7b6202c SHA-1: 04a7d1b663514b2effab92ea8ae08acb11a25039 SHA-256: 535035995b1b61c415355a2bb2189aed300e2d73ad7e2040f1e23f9053780cbc
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, with one prominent URL pointing to a suspicious domain, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/123?utm_term=audenshaw+sixth+form+closing PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459481/normal_5fe3beb880c15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503390/normal_5ffabfcb78555.pdfIn PDF document text
    • http://serawuv.mygamesonline.org/allegiant_book_free.pdfIn PDF document text
    • https://wijodemarivupi.weebly.com/uploads/1/3/4/8/134861972/xaturojafetuni.pdfIn PDF document text
    • http://govuled.mywebcommunity.org/six_sigma_black_belt.pdfIn PDF document text
    • https://pimujupaz.weebly.com/uploads/1/3/4/4/134440235/e251f370235b457.pdfIn PDF document text
    • https://naridinefe.weebly.com/uploads/1/3/5/9/135959872/9784072.pdfIn PDF document text
    • https://fifesijewawo.weebly.com/uploads/1/3/1/4/131412558/1368527.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_d59dd872028b42018ffe831cda047beb.pdf?index=trueIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_4af8bb32c5704ae2892d930f59814f4b.pdf?index=trueIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_3202fd2c6a8e44f5a25041056310bc48.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/bendigo_health_annual_report_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/33223327992.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/76496274063.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/anniyan_bgm_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/firuxotogawewirofa.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/58284111184.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_829cda655509471e92bfce2da7df6aa9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zagubip/fekazujizotadomel.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/bise_fsd_supply_date_sheet_2019_intermediate.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/best_man_speech_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/bedardi_guiya_nagpuri_dj_song.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA46 5584 bytes
SHA-256: 5f105490d18f64a8c2b97d7a9327e5423e88eade52e74e70dc7ef5a160abf6ae
font_01_sfnt_off0000fd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD34 11440 bytes
SHA-256: c925085e1b0c2a2ddd3e60b1e194e97463b31cea3828dc97ceba890b93b80051
font_02_sfnt_off00012466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12466 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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