Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79562dcd3cece9d…

MALICIOUS

PDF

68.5 KB Created: 2021-09-28 23:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 525465789b4efbfd0af6a5d202ea214c SHA-1: 2bb73c0e52b54dbdc3522298ecb5c94d746f0314 SHA-256: f79562dcd3cece9d7a37d2f7c9eb91a4baf437887d6ecf1a4aa4c6db0d08645b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The presence of numerous external URLs, many of which are linked to disposable hosting and utilize UTM parameters for tracking, suggests a phishing or malware distribution campaign. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into clicking a link to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=video+editor+android+terbaik PDF link annotation
    • http://ekbdrive.ru/ckfinder/userfiles/files/xugoxazukevunas.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/lobamosexineg.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/noworeja.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161533ce794177---dixuxexomuwafixake.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/57841543379.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/gilikomowafoxatumuru.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/25370443972.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/ruzijimesapowojalirugo.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e3e8ac9e757507d686ff1ba104400ea4/27319581054.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/jadabitabakefexubijezego.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/sozesediwipagopiril.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/69063131207.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/52345760220.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/97426000788.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/91367198941.pdfIn PDF document text
    • https://granitnet.hu/editor_up/kudatujutaxesudik.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/3456501597.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/folegil.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210912_92A82CB94CFDCBC5.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/43593615150.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/webotozujumukani.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/gigadonudekiv.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_off0000ad72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC589 10228 bytes
SHA-256: 5112af900daeea806b3670fc455a5cb11b7b4d15471f187c0ddeea882baaf3ae
font_02_sfnt_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 15728 bytes
SHA-256: e454988f633626083a5aa4b97f0bfd109ab3039fc9526634668a5caa9d56dc5c

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