Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40164494c9e9629…

MALICIOUS

PDF

92.0 KB Created: 2021-09-20 23:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 492e9ef9aed89fd3ebf3364576cebd3d SHA-1: 85557ee2641b8277977e9dfd8c97b751b96ef8cc SHA-256: f40164494c9e962948b356d2e5e41a3cf62a3924d7a3cca2796baaf5512c81d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. The PDF contains numerous embedded URLs, with a heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were directly extracted, the nature of the PDF and its embedded links suggest it is intended to redirect users to malicious sites, likely as part of a phishing campaign or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://soosekszer.hu/upload/files/37309183107.pdf In PDF document text
    • http://llux.vn/uploads/files/dedeku.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/kukuguliwi.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/gapoxijelilib.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109031249599025.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/59787076050.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/72725651453.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/bumamijodud.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/48608727315.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/80402403053.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/95000405904.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/scJZzyHtpnXI.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161435ed40f66b---16625746134.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/71887046374.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/xovexoliwixenaxepov.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/digitetulajalerov.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/89846969544.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210909/file/wibegetumik.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/40009570059.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/7913085993.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/vezasebirodixarajoxubolin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=hungry+shark+apk+2019PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AB 10800 bytes
SHA-256: 4f7b7b0bc8cfd595c2bb3ad3d9f4a5396c08a6720715420649185d3b5cf98d4f
font_01_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 16336 bytes
SHA-256: 79c1468ae33b34447a6dc5d5fa0888a6e3071d3bd568909989f7780c5389b11c
font_02_sfnt_off000101e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000119f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F1 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_04_sfnt_off000122a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A4 24732 bytes
SHA-256: 3521dd9b2d36b5b31fc731b36bb1c67f80d1628c220129f9797ac3533b28acdb

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