Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e4f611e97d3b6f…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 06:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6556b44d89bf58662f8663b22a201c7c SHA-1: 429570f95e6277b1bc6d045e3f083ba0e06b6096 SHA-256: 35e4f611e97d3b6ffcb3899f0f30732ebb9496ac75b7a8ce7cdd069fc55b5c12
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links to external PDF files hosted on disposable domains, indicating an attempt to distribute further malware. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves tricking users into clicking links that lead to malicious content, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=fear+the+walking+dead+6x10+online PDF link annotation
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161510d3bc5d9f---dukoxedugavarunivipi.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/53643787126.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/7c2lc9nigfl9n2iuraa8br04v0/84391498465.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210908_387499AC8B4CF327.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/40749657484.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/fetadoxum.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/vivupogijidufazatoko.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/mutofotumivalosalokaku.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-05-23-34-37-aUKqPerT.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/datokelizewuzedaxok.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/30636992737.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/wuwetegezururosodipoxumo.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210913033018818.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/10228389582.pdfIn PDF document text
    • https://mackbeks.com/files/file/90191798192.pdfIn PDF document text
    • https://renault-service.com/userfiles/2278823554.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/51648234234.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/latifovatukad.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/36555113581.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/jepobi.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/4061229638.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/72592582556.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/57873838118.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/donerafivovemawadedobo.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/sedonigifiwivaman.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/79163033659.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/16376750017.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_off0000b52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52E 10960 bytes
SHA-256: a81d9793bc6e8a8faba314d1b42c7a84b13dbe2c87d593fc78b3ff59f118d0bf
font_01_sfnt_off0000ce68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 15336 bytes
SHA-256: 14924acd3ce42254eb856c3336e3a60df9e1323d9a7c4f417582c0c9bdff11bc

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