Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a85ab0f502f1b9…

MALICIOUS

PDF

78.9 KB Created: 2021-09-11 22:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f37940a0db9fec8d9f3fdaec77dfc7b2 SHA-1: af3688cc847046fefc8f5e2f118237b6dcc1d74a SHA-256: 76a85ab0f502f1b91135045d206ed6d7d269d52bfb3bc26ed5b4d41e0f3794d8
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 it is likely a phishing or malware distribution attempt. The document contains a large number of embedded URLs pointing to disposable domains, many of which are disguised as movie download links, suggesting a link farm for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=downfall+full+movie+online+free PDF link annotation
    • http://andlupa.com/userfiles/file/14713121464.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/kizodumorunidat.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/kagofamaduto.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/59584221943.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/xafivogedinis.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210906_CE854ACF3CCF40C6.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/zenosawodezazowusak.pdfIn PDF document text
    • https://umartravel.com/files/68386531523.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/binajotizegekedod.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/jovemo.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/pinuxujur.pdfIn PDF document text
    • https://gilbertems.com/videos/file/21105215542.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/xavakivuzara.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/bexefumaxefesufogi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d13fe6c4e---xubid.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/83173871335.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/86217277800.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/32324502691.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/59572178520.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/wobose.pdfIn PDF document text
    • https://www.confirmedtour.com/files/87315832617.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_off0000d2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 10360 bytes
SHA-256: d71f42597b703eec4a1e544fc0a8960b979b546b885172ae45ec64c234bb29ef
font_02_sfnt_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 17300 bytes
SHA-256: ad744616856111df185114f03ba57aba6777a35c927742c45385e3414faecc1c

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