Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0d469dcb507f34…

MALICIOUS

PDF

104.9 KB Created: 2021-04-06 17:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4595ba7ccdd430d67bb589e8800c7c35 SHA-1: 581815a93b5fb834bdd5342ec57fde663432e764 SHA-256: da0d469dcb507f34cde96473a6365ef76823feb3ea3ef600feba5a56f98b8ee5
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jottigo.ru/123?utm_term=indesign+shortcuts+cheat+sheet PDF link annotation
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/nelupir_vizike_mokalu.pdfIn PDF document text
    • https://bobenetawif.weebly.com/uploads/1/3/4/6/134666578/1960908.pdfIn PDF document text
    • https://tedinuvade.weebly.com/uploads/1/3/4/3/134348171/goreporog.pdfIn PDF document text
    • http://sarawavenudiwap.mygamesonline.org/tinis.pdfIn PDF document text
    • https://xumefuzodagugud.weebly.com/uploads/1/3/1/3/131384373/febagipenok.pdfIn PDF document text
    • https://xafijedalab.weebly.com/uploads/1/3/0/7/130775792/jelarag.pdfIn PDF document text
    • https://mufebukevep.weebly.com/uploads/1/3/4/0/134096334/wetelaze_birogokoxelozan_lufesogoromawar.pdfIn PDF document text
    • http://wivevadevenumet.mywebcommunity.org/dave_brubeck_take_five_sheet_music.pdfIn PDF document text
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/45a694b9583a.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/gixirojozogufux/98753463333.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/segiburujiwinidatowopal.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/quotation_attached_letter_format.pdfIn PDF document text
    • http://bexukavibume.myartsonline.com/what_were_the_jacobins.pdfIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_81bd4cad96bd40e9a2e0f4f8b9754d3d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/jopurufuvexiwikona.pdfIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_42deac42fe704068ad6908adce38418e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/tone_it_up_workouts_2020.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_off000145dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DC 5104 bytes
SHA-256: 940cf6b137a3828c737bc6f8cebe3ce530937525d05e531b7558aaf11345e7e3
font_01_sfnt_off00015730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15730 11668 bytes
SHA-256: 42c57e523447e61eb5677bfa1ee4f03a3aa1faa515bd118765722b4c7e44875c
font_02_sfnt_off00017f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F34 16740 bytes
SHA-256: 8030332e5af839248050be5aa97b8d40707618117f6f98572892c617d5a9fdf3

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