Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52be836a225d3dc…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 01:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ac7b44aabd86b5945008e5bf2327b55 SHA-1: 157a5424a588169a623c477b9121fcb44c28d3e5 SHA-256: f52be836a225d3dc988b941c6db9b3f764719661b80c168b75d3f9edd2f3d126
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure due to its small size and image-only content, typical of a screenshot used to hide clickable links. The document body is heavily obfuscated, but the heuristics and numerous external URIs suggest a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=zapya+file+sharing+app+android PDF link annotation
    • http://ecofincas.net/ckfinder/userfiles/files/pavajewi.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/dawubigetixavavilivatuj.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/17072563285.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/18725250748.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/52927573055.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f86408fb4---xozaparikini.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/15596368969.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/tovopobeg.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/73622856114.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/wikatufezaxa.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/9699445834.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/wirenuburozajokazevomel.pdfIn PDF document text
    • https://bliznacite.com/files/36478028059.pdfIn PDF document text
    • http://orthopediedelft.eu/files/71625506353.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/4432410708.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/zojomitotonenunew.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/rulafotipobukafuf.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/77914019746.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/xozuzosis.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/kigajilebotimib.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/xegajek.pdfIn PDF document text
    • https://bursac.net/userfiles/file/selopubozatu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E8 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_02_sfnt_off0000cd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9F 10756 bytes
SHA-256: c14687e20aabe4f761c5d1e99b23f9e7a55fa312ae0d9052a8c8c802e2477647
font_03_sfnt_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 14100 bytes
SHA-256: 697f7201344e8c440b792f6b4f2c6625e282237a3833b4661537b99e206d07d0