Malicious PDF — malware analysis report

Static analysis result for SHA-256 45563c964b8738c2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 13:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea9caebd343966135b2b228756245a37 SHA-1: d6505cc1746c20d504eb68cf61dd30ddf7d582be SHA-256: 45563c964b8738c2dd7675be854afc9b2184a62059435355ce237b2d869fc9a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous external URLs, indicating a link farm designed to redirect users to potentially malicious sites. The PDF structure and embedded URLs suggest an attempt to exploit users through phishing or by serving a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=major+9th+chords PDF link annotation
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409b5b9b780---44829085079.pdfIn PDF document text
    • https://steammining.com/userfiles/file/1006492798.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/26577186068.pdfIn PDF document text
    • http://electric-kernbichler.at/nuvonasuropanikogirik.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/32306150320.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/95769900282.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/wetidajotav.pdfIn PDF document text
    • https://kvzriu.org/images/file/42958031132.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc2fa52f41---xajemaguxarezunop.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/desufuzejobajafibemo.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210901162547.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/23426772925.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/99873561496.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210911114152.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/sokolupizisuwu.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/kurub.pdfIn PDF document text
    • http://precisao.net/files/files/zavomu.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/27676111113.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/jazereselawa.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/33988651745.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/50095207459.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/39249824882.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_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 18620 bytes
SHA-256: 0ffd9be0b0f9e9b711fe59fb8afc64c8604b5d813ac965f01f2041a3d1eed43f
font_02_sfnt_off00011fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD4 10384 bytes
SHA-256: 2282c1083956f85fc7b8c0d59a0a94f3adada2525bf9c3d7c3391ab6e3c6ef56

Open this report in the interactive analyzer, or submit your own file for analysis.