Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11ee5300e5299e3…

MALICIOUS

PDF

77.3 KB Created: 2021-09-19 00:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b12c3db17b04b92fb4550fdead6b9957 SHA-1: b9407ee369a86165a1c6cc6b4a6916f6e13acd97 SHA-256: f11ee5300e5299e33dd937b0661b3b49b24b23a0f40ed9550e65eb8ba454fe36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, which is characteristic of link farms used to distribute malicious content or conduct phishing campaigns. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://etoprosto.ru/ckfinder/userfiles/files/64253701669.pdf In PDF document text
    • http://congtrinhnhaviet.vn/upload/files/56097053401.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/2329788572.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/tijulonubut.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141ab3c44126---bokuvukagewerupag.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/78196652606.pdfIn PDF document text
    • https://seger.cz/userfiles/file/zezavasozej.pdfIn PDF document text
    • http://coachhouse.info/assets/file/gewufifepagowaf.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/senowosujuzifaparebi.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/91119065671.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/50846728098.pdfIn PDF document text
    • https://tsolisp.com/files/file/vogowotenidu.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/tonetagesebuz.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/92814503303.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/91398842044.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/mozofaxilusulopirapefax.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/29164839129.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c7524b0b1---genepepiri.pdfIn PDF document text
    • http://kdekdyjak.cz/data/30403856182.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/57009817195.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090311542473499.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/92007238273.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/durekenunaloma.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/woxajotinuxolasoxitus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=game+booster+apkPDF 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_off0000c484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC484 10440 bytes
SHA-256: c2f4f165100b390f9bcbb4e13f7fb7ac8babd9cb2ce1079ecb54e0c637873d3b
font_01_sfnt_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 20152 bytes
SHA-256: 494965be98937cd2d0e5febfe97a12b2f1c8b00290dd90cf5ef8a9cf9c4b52fc
font_02_sfnt_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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