Malicious PDF — malware analysis report

Static analysis result for SHA-256 36fa6ad2d3226fd4…

MALICIOUS

PDF

75.9 KB Created: 2021-09-16 19:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1f2aced2e4493e72e7918ccd2f891b1 SHA-1: cfbc050ed423cbbbc05c760266792527fbaad11f SHA-256: 36fa6ad2d3226fd468b004f37dcb7ecd262ff5fad138e42ffd12fd6d8bbf1fe3
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 high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing campaign. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=droid+razr+specs PDF link annotation
    • https://festacontinua.it/public/file/zudosumodev.pdfIn PDF document text
    • https://aromamarketing.md/img/files/neroforenuzozosi.pdfIn PDF document text
    • http://gaudi.tw/upload/file/wajojifewig.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/tetipiduvivasosedat.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614015c630189---madeju.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210914143637.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/63807028997.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/xusugalozanakopewo.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/jixawavoje.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/mavogupobod.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/totapajopavemonudazis.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/33218377088.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/binujubafevo.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/984315615.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/73712149576.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210904_5141B38FC9DFF5AB.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/kupezuvikagivufokuso.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/xigumotuzideso.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/vapomuwir.pdfIn PDF document text
    • http://ranczowdolinie.com/files/53082214302.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/jamejewisemugirowigeru.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/54890058684.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_off0000c44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC64 10320 bytes
SHA-256: 698df5de98fa5ac86096bb1ec882ec380262a4d02a4feb5993c7cd76fccfecfc
font_02_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 17808 bytes
SHA-256: f28efeabccb9712a673f203fd1cd31ca2cda325333137d80fe0739cfdc0e8acf

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