Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b190900a94ec99…

MALICIOUS

PDF

75.7 KB Created: 2021-09-13 05:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3fc612c319a0f91b688840166d2f88fd SHA-1: 2cec386bc543c904c82970036c4323a4a3b59975 SHA-256: 89b190900a94ec992564b9600bb584bfa93fd1dff51ba8ecae8788f286851531
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=silent+hill+gba PDF link annotation
    • https://jodhpurtravels.com/nbloom/fckuploads/file/52549390211.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/lavigabalaviforotu.pdfIn PDF document text
    • http://identik.hu/editor_up/97754389713.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/vulakozidelefolasavimo.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/dafidifufa.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/78010151128.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/82049125558.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/29777479296.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/doweviluwidukod.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/timivirulagumusisitasit.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/mupirijilorerafive.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/tudok.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/segupixisapuvifijovu.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/vakabitepejoko.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/sabasufet.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/32914275186.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/55277214013.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/3977723715.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/89636757824.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/69518821678.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16137aa779f8f4---xesobijawutogediwe.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/laruwadozokizutumu.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/7314000311.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/nigula.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/vawekutomejanokenaj.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_off0000c2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FE 10216 bytes
SHA-256: 1d3b36a885a9fb23c779a49b11a573a922ea57ec804b9393b182a6aab79df453
font_01_sfnt_off0000d9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 17884 bytes
SHA-256: 65a50334017213d6f060d922727dc975465f175a1b5da9e05797acf17ce950bf

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