Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49f42b200c55a89…

MALICIOUS

PDF

68.1 KB Created: 2021-09-16 22:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68edf54f9e8afd23ceb80f74239f52a7 SHA-1: 5e6843b0fc7dea0781d0caa1f84687f958822950 SHA-256: f49f42b200c55a89e1b0fa800faeea5581761bd6d36bd44519fa7371f39e8150
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to external sites, suggesting it functions as a link farm. The presence of external URIs and the link farm heuristic indicate a likely attempt to direct users to malicious content or phishing pages, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://chcial.ru/uplcv?utm_term=most+downloaded+themes+for+android PDF link annotation
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16140b3642a1b9---73316824931.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109071035263833.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/41850396812.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/ginekaf.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/25828394698.pdfIn PDF document text
    • http://sswjeans.com/files/vajumefumozodoregatiba.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/r2kgo2q0u0qnc1e1o10nc6n4m4/ravopamipenegunukepol.pdfIn PDF document text
    • https://invision.buzyhub.com/files/91791163264.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/2563886895.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/gipisopasobafo.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/dimakugo.pdfIn PDF document text
    • http://viorina-deko.com/images/file/nesegotosikajutofevanov.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/73415420997.pdfIn PDF document text
    • http://badgerhillfarm.uk/detevoxonugapafipek.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/geragosesufobezobo.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/wapenizesosuxogorison.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/37183399703.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/fabuguwojumonozevogobuv.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/57600633671.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/72228599724.pdfIn PDF document text
    • http://wmsone.com/eimages/file/44106384865.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/sosariv.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://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_off0000aef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC706 14104 bytes
SHA-256: 5242008565f016601fb1d1849b77c4e5a4c5b032a2f08c17e11b4d280e779039
font_02_sfnt_off0000ea2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2C 10696 bytes
SHA-256: 409622cb41df77f5c262ae6c34316745cc56b2fc1935f3c70bc7b78b9b91ac17

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