Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76f9113dad1a7c3…

MALICIOUS

PDF

73.4 KB Created: 2021-09-24 02:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e86b48b0b47cfe9a3017b34ae5f692e2 SHA-1: 4853a1d55157aad845a73438e6507d52cb81b0bd SHA-256: d76f9113dad1a7c3cda0d0dd32c79a9161b55fa9efb46b71467a58d2b622ce71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or SEO poisoning attempt. The presence of external URIs and the structure of the PDF point towards an attempt to distribute or redirect users to other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://machnhaduong.com/images/uploads/files/66937435688.pdf In PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/dadakavewowakewasikofepu.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/57922432082.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ce19cf21243aeed521c9b98a5b2d7de2/67736575089.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202108311705278597.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/jefem.pdfIn PDF document text
    • http://teakdeck.pl/files/file/zesetivaduwef.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/roliwuk.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/kusikobefor.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/92733693265.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613032a943d29---nurepajafokenofur.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/88635392757.pdfIn PDF document text
    • http://marine-inox.com/i/File/61973246367.pdfIn PDF document text
    • http://195exim.com/datas/files/nigakapefagovax.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/monilorewiforawofoketobow.pdfIn PDF document text
    • https://fratellifurloni.it/file/56582421454.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/35115633384.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/62914136199.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/7221891264.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/64645765516.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/61070190606.pdfIn PDF document text
    • http://synhbio.com/upload/files/bisaralis.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/8532809181.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/19493336551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+tamil+song+download+app+for+androidPDF link annotation
    • https://easyown.ddproperty.com/datas/files/52820188324.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_off0000bc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC43 10980 bytes
SHA-256: b2a174b0d2c7e3e21183090eca36a688be9f3223e67fac139a318328b066e6f7
font_01_sfnt_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 16412 bytes
SHA-256: f57c4101b1a03986aeb9d1bcf3cf49de98451831934afdae26e27ad32f41d22b
font_02_sfnt_off0000ff63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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