Malicious PDF — malware analysis report

Static analysis result for SHA-256 e172dc11c9afd39c…

MALICIOUS

PDF

89.1 KB Created: 2021-09-10 02:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e2f7674b7dffff99575305531f3806a6 SHA-1: 77baaa7ba26c697d3ee33f94039211451927f050 SHA-256: e172dc11c9afd39c7aa7eb73389ba958f73470967bf4e5c6eba5ab3d04c5d812
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studybrilliant.online/app/webroot/img/userfiles/file/tozubonikiveg.pdf In PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/kixafudamo.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/mubazewuwanizurizexase.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/95681281090.pdfIn PDF document text
    • http://zimmerei-possert.at/98852829915.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/mibetutisipotej.pdfIn PDF document text
    • http://stl-hk.net/userfiles/xabinawudegekibib.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138575b600ae---15807819101.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109080248335229.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b08a43a7a6b9037fc3b4413bd8e273c7/70581840516.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/dowenirob.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090522325673499.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/83727332418.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/fuxalevurefobozet.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/tudol.pdfIn PDF document text
    • http://vhktn.at/images/content/files/tovono.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/jelojolunusowufu.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/bazexorudozopeki.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/zemulexeniwikonexoxigudom.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/47033426902.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/fudopexusuv.pdfIn PDF document text
    • https://euchebnici.com/img/file/6604066942.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/garurij.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/gezefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=quem+inventou+o+sistema+androidPDF 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_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 21528 bytes
SHA-256: 12b12861e2c4a1e17ed8eee2bf935b78e32615d6c005b5320a5281afdda40b4c
font_02_sfnt_off00013e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8A 10588 bytes
SHA-256: 972384251a3400f6a7cd3780a02a1a8613f8c34036cc5acfac50d439e7b96236

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