Malicious PDF — malware analysis report

Static analysis result for SHA-256 822a4474337541b8…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 07:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 20a5a667f2604ee655dea99b686efaf5 SHA-1: 9c864c39ce375f1a829ae36e0e5dbb484ba38616 SHA-256: 822a4474337541b8c292cccbb36e70041b0b763020f326a66410b54524680f79
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers also flagged it as malicious. It contains numerous embedded URLs, many of which point to PDF files on external domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, commonly seen in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://trungtinjsc.vn/upload/FCK/file/getikajet.pdf In PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/87623800109.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/safivolemanokovigenumav.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/59800773380.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/patalusukiretivutakogibos.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/zazugubogejugonuterela.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/fapitepodojudedukemimoja.pdfIn PDF document text
    • http://scsytech.com/upload/files/namifalilijaxeturidikegu.pdfIn PDF document text
    • http://ruihuitax.com/files/file/6104688482.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c0ff3ea30---zoxipujulixabufi.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/duwoxejokanoma.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/15365153607.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/pezawibu.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/66048602113.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/33820638960.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/jixutagoxisabuvunakesovot.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/runagezodilif.pdfIn PDF document text
    • http://anindecor.pl/files/file/torilevujubep.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/napijaguwotuzevegofo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc729784e---94281336043.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/rigudixaxixofida.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109161036291598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=watch+legend+of+korra+episode+1PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC4 17684 bytes
SHA-256: 8f1ce3f5decf3492d21235ed845eccf9855eee3d43bd67c40834dab79d49aa64
font_02_sfnt_off000118c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 11036 bytes
SHA-256: d4ebf2cfdc409513c0b5a07590b81422e3819350487c2322fe449d4501c08634

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