Malicious PDF — malware analysis report

Static analysis result for SHA-256 7594b1d4de540415…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 14:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6063e9d0e91f38a69734a06c6897faa SHA-1: 2e6644a5934e31f18bffc219e1d7d8d01ddf7c36 SHA-256: 7594b1d4de5404154cf712b7f70cda09b2d1ad67bbf4d22bf9b8c1c4204f93c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were directly extracted, the PDF structure and extensive URL usage indicate it's designed to lure users to malicious sites, likely as a first stage in a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=i+guess+synonym PDF link annotation
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/famodelogi.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/zojijimirevimurebetuvuz.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090422295021.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/2623475263.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/18403928154.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb773a08b9---tovifuso.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/taxorebolesazufoj.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/valot.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/suzes.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210904123508.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/65281998349.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/56093853463.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/4522166394.pdfIn PDF document text
    • http://lejonhund.com/upload/jaribolimuzokadexegodate.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/sanalazufusesepewoped.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/jesadow.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/76554940354.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/51337797833.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/55220975796.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/jasevumawipubodob.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090308071220.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/wokufigav.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109031256228237478pejkg.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_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 10116 bytes
SHA-256: 9e176bc6bc02065660fba8de59458af6bba942ee47674d1d09b7eeac69ab2334
font_01_sfnt_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 18272 bytes
SHA-256: bb5357a0eb30b0c082a5c0a15151c5f8e793549a72e0284ad9568987e6c0790e

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