Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a79e3cdd7474fc2…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 06:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd29727d631122e3776775349d7d692c SHA-1: 6db3d42dda4b78ae0dae9446bcf3edb3dd57ae44 SHA-256: 5a79e3cdd7474fc20851a53c969b51959f89c274d1a435f8bfddb65af227a8bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://drafthe.ru/uplcv?utm_term=es+file+explorer+apk+pc PDF link annotation
    • https://fasaac.org/temp/files/mufabinusuxedubuz.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/ginafofekopibelatutuliket.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/toxejurasegatesatu.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/dumijukewawomudolojo.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/79300225557.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/pudapavomulozupovel.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/nopijuvemugujobenosomeras.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109072023213587.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/44993586661.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210905010741.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/fawalegafuxirobabotajotiw.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/zaruluduzagadusewete.pdfIn PDF document text
    • https://menu2uplus.com/images/file/59206873008.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144fae9e8e79---kironukubetetigovasajenor.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/66798083515.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210901_47C065A0F81F48D9.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/25878402431.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/tifuxofuvosur.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/vuvemujefujunugibaxosip.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/xiwaz.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/26863566468.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/disawepomusam.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/falusepidewijudowegof.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_off0000c2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 20128 bytes
SHA-256: ae2b4ee2bf78983b9c7b72ada04a398cbec9b56620e2fb922fb3d53c0768c6ab
font_02_sfnt_off00010f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6F 10448 bytes
SHA-256: f38569d392e910b66f408f86ce7bf0f180cae07ca74e0d925eb2682edafa3c6f