Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7b8bf54ac374a3…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 21:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0eaaa2a707497f17c52d39718544f20 SHA-1: 725f229b2a0ba33ebcd827accd77c696dbffd41d SHA-256: 5b7b8bf54ac374a3cf7ccf22d869ae828b720ac315322533a480be29401a1f37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=best+app+for+taking+video+android PDF link annotation
    • http://sparan-art.ru/ckfinder/userfiles/files/59356834698.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/26819476122.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/libiled.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/75582715260.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/wigimi.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/74579917894.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/tetuvikenefisixumijar.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/bixuzuzodusi.pdfIn PDF document text
    • https://allianztc.ro/files/file/65490252588.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/mowifalaxale.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/jopibuzewetaxagoperipe.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/95519679874.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/reboxenexujoteri.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/80048464764.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/64007284767.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/woxaruwefabisuteko.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/36466394202.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/vutiwizavoliz.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/61940545850.pdfIn PDF document text
    • https://cardolf.ro/files/21900653825.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/11715469419.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cmj0m845faraqut216e5uubc50/bobolovezij.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210908/16310588852484.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_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 10836 bytes
SHA-256: 7e83c05751f90febcf65338ad58a1d359d3acacbdd639246404f1f8bfb669e21
font_01_sfnt_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001140e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140E 16732 bytes
SHA-256: b11a44edfe9c278c68bda36be9de30a5a39f1a61a3aef7b315b072cfeae4c859

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