Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89175291bf124d9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 17:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d5ce9c6653d60406744e3569a8e5d85c SHA-1: a27459d00c85b4bef0c25c4af9d5e01a3fdb76f1 SHA-256: c89175291bf124d93d19b9eb54f17a10601ed19f6f09bdef475f9f2141474a16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for link farms. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection results strongly suggest a phishing or malware distribution campaign.

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://marinapogon.pl/upload/file/28274359696.pdf In PDF document text
    • http://aapltd.net/userfiles/file/tagoxabu.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/roxugesoluvesupepasemij.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/88916196146.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/11779740503.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/gijut.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fmkj1q6e6qi2ogjb15ncd8lklm/womogususilapewik.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/zigin.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/4cd3ce1271da49210af52e2bcc7a3c77.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/54370188286.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/lewemagepa.pdfIn PDF document text
    • http://fgosvo.ru/files/files/gavib.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/29488076342.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/sd4g82o02k72ftoponr713mfvc/lorolodiv.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/raxazoweb.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/2130933729.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/gobagi.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/22964627306.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/26493805582.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/zomov.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/gomogexozowisivinajifuse.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/77423792799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=surah+yaseen+mp3+onlinePDF 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_off0000cfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEF 22300 bytes
SHA-256: 535f4283a7b850e67b20a6dc6b9b5e10592d54c3a47a608030289502d6accf62
font_01_sfnt_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 10880 bytes
SHA-256: a50d5fa38598b2225b835b23826ff907549f46216e0d4a2e0c3957ece6d739dc
font_02_sfnt_off00012224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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