Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffed22e7d16fa0f…

MALICIOUS

PDF

75.1 KB Created: 2021-09-17 04:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b37465e01bbd6f5e420dd208e23e455f SHA-1: 8a392d50b096a54b030580e77d015674435105ae SHA-256: 6ffed22e7d16fa0f4d14c97d5d61e39993297b6ee5e48f4bd53a43c0b2676078
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting, indicating a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through malicious links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=hbr+on+leadership+pdf PDF link annotation
    • https://kaparatt.com/images/File/wifalajaxu.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/niwel.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/kubigari.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/xivij.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/53702822393.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/57801069787.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/butasekaxesezazojuna.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/tewitejadofoxufakane.pdfIn PDF document text
    • http://hanifeugur.com/image/files/fameba.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/99285508055.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/tafaruleleziti.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/6456719180.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/80631517381.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/80048464764.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/sodukepuvitupomafejub.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-5/20210905100413519631.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/pazesabikofij.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/tuwozejokubibosu.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/42987699755.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/pumiguluxuxebakapol.pdfIn PDF document text
    • https://flammerouge.ch/userfiles/files/24170611994.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea64432401---38380807775.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/a1c42f6ec429d68f6f53beb5d71ad2e5/48876084146.pdfIn PDF document text
    • https://lapdonline.org/file/41240642975.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_off0000c41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41E 10628 bytes
SHA-256: 45c9c50d7650ddaa9d8b469c7487e3c369daffad325f7a8b4e0581060b2ca484
font_01_sfnt_off0000dc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 16732 bytes
SHA-256: c0373f6551c0e1f4247dce0e3a02876850ca58e3cd5adf518c4bdc6ee3e0546c
font_02_sfnt_off0001076d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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