Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dba2a466c627da6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 09:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2f6b3a1280f35ca12b726cb320c1fb6 SHA-1: 3a410300c35c8f4375eda834193fa0950a3d7e6c SHA-256: 8dba2a466c627da6fe224a8125b4d72d69c23ca343b624e43bd8825e2d52bc05
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/83163809512.pdf In PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/f32a99220d9354bb34155bcfd31c382d/komakuturu.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/57604299759.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/53491808326.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/vezidisixowavevowez.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/kikizowakebobubuludiril.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210911082132.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/42510804212.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/80411066666.pdfIn PDF document text
    • https://baongochoa.com/upload/file/manoruferiwawow.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/voborapufigidok.pdfIn PDF document text
    • http://someteme.com/archivos/_20210907171848.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/34539698314.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/fivinenomadipa.pdfIn PDF document text
    • http://savemaxint.com/files/file/6767009773.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210911152034.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/39854175408.pdfIn PDF document text
    • http://web5gstore.com/Files/files/bikezuduvositadufanit.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/vosob.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/13748947444.pdfIn PDF document text
    • http://winso.tw/userfiles/file/jisijanodarenaxarotok.pdfIn PDF document text
    • http://abworder.com/uploads/files/kuwerodejalugisigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+the+otg+function+on+a+phonePDF link annotation
    • 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_off0000daae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 10708 bytes
SHA-256: b75b359f90f0a1aa9eaf2dd6e61dad62c68ee340d5ec2db881a608ba8f4cfd07
font_02_sfnt_off00010b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5D 18368 bytes
SHA-256: 3d265759ac5db5dc211030367f8e303b59b1a39eb138c19d38657728106d35de