Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a8cb0cc6e3120b…

MALICIOUS

PDF

76.3 KB Created: 2021-09-14 15:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 73729f89086375bbc8965f5ba080b03f SHA-1: 044fbd9bf68ccd819729fd04548d9bfd60b8da2a SHA-256: a0a8cb0cc6e3120be090c5846c63b9feacfe8d869c5ffb93c930e9780ff224e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for distributing malware or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=wrong+turn+4+watch+online+123movies PDF link annotation
    • https://pottoka.info/files/galeria/files/fitezogojotig.pdfIn PDF document text
    • https://umutfm.com/resimler/files/96326093061.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/nojevisogifetut.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/55967636557.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/41136943628.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/12716402496.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/momubulonizoz.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/20191647938.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/16179208286.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/90454132521.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614025406443e---33595826816.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/46887177912.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/11985278478.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccb7fe4098---21065846300.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/23730840816.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/19650201909.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/91565283992.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/jemaliri.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/lojonali.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/nazopudejof.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/2163654153.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/ketebarixutekegus.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/pafubarewore.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/luxasugo.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_off0000c526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC526 16632 bytes
SHA-256: 53f8d531bbb6528976b2fc7733c7c689828eba25b8243666bab66f1dccd2e348
font_01_sfnt_off0000f022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 11344 bytes
SHA-256: a9a8c3f67d0292b628b1bb358f1227ee1abaeb0c5362b1865362e4c4d3f344c2
font_02_sfnt_off00010ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1