Malicious PDF — malware analysis report

Static analysis result for SHA-256 7822b00c70519669…

MALICIOUS

PDF

80.6 KB Created: 2021-09-15 20:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f63fd35b20bc780be29e99f0920d105 SHA-1: 364b11eaa9f545be57371f7badefa2f3f3a301e3 SHA-256: 7822b00c705196692bc95af3931f26d9942d09e38ca4b4473a9c1711bf6b9954
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains and employing UTM parameters, suggests a link farm or phishing campaign designed to redirect users. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or lead users to malicious sites.

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://futboltotal.net/images/files/22161858769.pdf In PDF document text
    • https://kozlovka.mebel18.com/uploads/files/72488662278.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/045e26180c4c330b4baad8a8a24ed066/80378279297.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/86207558883.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/6071403451.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/nikowixikekamoni.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/79516348322.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/ninane.pdfIn PDF document text
    • http://sbkf.org/files/files/69537216917.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/latizunuxunufewetazikuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613019fd22d03---90215702773.pdfIn PDF document text
    • http://mq-water.net/upload/jefumanowofabofokelapapu.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/botetutili.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/79186031242.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/subewofovejewolefekuga.pdfIn PDF document text
    • http://wjcopy.com/upload/files/jazete.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/42675773863.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/vosonowipajom.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/70943275507.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/64389566144.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/96125382114.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-12/20210912230020713753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+pc+emulator+for+androidPDF 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_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 16872 bytes
SHA-256: 9d870d62772cc52326381e520678354065336d039a98c5d428e04cf09ebcb45b
font_01_sfnt_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE8 10800 bytes
SHA-256: 3cabf7a7745ee73064e9f23a605f958cd8ba875f2c2a013508876d62a57b0608

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