Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c61a774e7845ad…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 09:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b38b7ce7eb505cdda6eab27f19163de SHA-1: aab5064ec24b22364b3ee456854b0a4d54e310bc SHA-256: 38c61a774e7845adae9159cc37821e36ec50196a0178e56c25bbf2283f490b3e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure the true malicious destination or to distribute various payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://queure.ru/uplcv?utm_term=battle+cats+apk+mod PDF link annotation
    • http://bargiel.com.pl/ckfinder/userfiles/files/23971596036.pdfIn PDF document text
    • http://synfarm.com/upload/files/vomureketipadijavexe.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/vodomaxagowu.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/82516111536.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/80186208827.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/70070327752.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/27763446977.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/47611255057.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/bidugojosonafivuxaro.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/zobedug.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/44348466632.pdfIn PDF document text
    • http://tid.vn/upload/files/lawowof.pdfIn PDF document text
    • https://seikai.jp/free_images/files/98845058887.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/44106423737.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/49797323775.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/29785946669.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/22937848516.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/r92qjpns7meuldmqif7rkkit43/82626071876.pdfIn PDF document text
    • http://stylekd.ru/files/50143035483.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161305d8812c58---lozovawotisajodakosidub.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/25032819434.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/41696416030.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_off0000ca49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 17460 bytes
SHA-256: 0da0c305320baf6b3c4fc1b91021493652918ac39da46a88261d4e1aa6d42667
font_02_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 10524 bytes
SHA-256: ebcf54ff464f023c2a92fbc5ed47d8b42ded7f9becec345222c44be89c3caddb

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