Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a8a17204fe9b0a…

MALICIOUS

PDF

74.5 KB Created: 2021-09-21 08:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a1983512700dd3a02effb75a575af94d SHA-1: 895cd4a10149439afd0f2826766a58c46ead9a86 SHA-256: d8a8a17204fe9b0a81405c9cd48f58a6d19dbac28ce8b3a73082693b20b2f59d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a likely phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the execution of malicious actions via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=android+apk+download+android+ridmik+keyboard PDF link annotation
    • http://crisismobile.com/ckfinder/userfiles/files/mumefepitazawodusuruneke.pdfIn PDF document text
    • https://virker-ikke.dk/files/kalekovejixonaluraso.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/waxajomipewudaxosifebe.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/wewimaku.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/roxotizudodunimiwul.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/selazizugijasaroj.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/nodetexogezaxaralito.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/42104176111.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613887385de55---19582256150.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437c5d77a2c---dulumibopujerasotu.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/lisejozogegobelo.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/zunapevoxevo.pdfIn PDF document text
    • http://pensiunea-escape.ro/ckfinder/userfiles/files/bopesinusugigafanedor.pdfIn PDF document text
    • http://kisito.com/userfiles/file/1272430949.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/sipirugoporaw.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/pukitopifeturilafipo.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/musawemakomeku.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/20343959646.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/jozeluxumodigujerasediza.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/19493326574.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/moxalunobekosadal.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/kavas.pdfIn PDF document text
    • http://cudicio.it/images/file/sowupenarutukitirepodewap.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_off0000bed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED6 17280 bytes
SHA-256: b31c01f600b10b3aa96323f6b4f3eca52dc853d00e19bad44bc9d8b6b46ac808
font_01_sfnt_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 10700 bytes
SHA-256: 763fd195f32aa4266d40d8c9fcf7dc79d3134c0597dc85613d0ae3993faf5278
font_02_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1