Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90374c4ded59a7f…

MALICIOUS

PDF

93.1 KB Created: 2021-09-15 21:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99720a98a777e6a21083c8df0c167248 SHA-1: e8e4cddc4621ab8974e5719bd54681061a9327d1 SHA-256: e90374c4ded59a7f05479d4cae135e2dc622c5e059c40aff75db198b3db4502b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or appear to be part of link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://pistant.ru/uplcv?utm_term=friend+request+123movies PDF link annotation
    • https://cribpointonline.org/cribpointonline/userimages/file/11155859782.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/70421010091.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/88492661190.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d17ea79d18---vogijadaxofitagapa.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/75986938815.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/61466694073.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210907_094545_123.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/jekanezaxirufed.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/48892898507.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/viruma.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/20358267574.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613470518a274---witasasoke.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/sojukasupogolagiwalezutin.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/xumuputetojaw.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/75164437173.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/29790621406.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/63543677272.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/3194201802.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/45414959103.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/41652018073.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/85785528362.pdfIn PDF document text
    • http://tolgyesvolgy.hu/userfiles/file/gakelop.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/14609545418.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/mutevativ.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/70001689533.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/nipujajaxe.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_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 19584 bytes
SHA-256: b758fe351a0f3fb814f167505dd5dec7cee5bc27320a1f46072dc59cce0a24d0
font_01_sfnt_off000135f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F4 10836 bytes
SHA-256: 20bb9c18761ba9da6aa891164c5dab3b3cf3a5d2f4eda14c0351ed6ad5c7d86a
font_02_sfnt_off00014edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1