Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1635e5211daf441…

MALICIOUS

PDF

76.9 KB Created: 2021-09-15 11:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55e4718e7fa52266249c6ae3ee5a2f26 SHA-1: 6d977c8ad2c7cb152b0114a605713e4eacb6213a SHA-256: a1635e5211daf441738253c2fe0669cf574915afc01cecdce220673195aefd37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/uplcv?utm_term=spin+to+ff+diamond+unlimited+coins PDF link annotation
    • http://innova-perila.ru/upload/files/tabulawoxu.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/zekes.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/45599113125.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/nagaledotugir.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210910054909.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/sifoxugawumazibana.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/betojebitudiladekanen.pdfIn PDF document text
    • http://annabarons.lv/files/files/nigufuzanevojupexawisux.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/mowupuxematu.pdfIn PDF document text
    • http://envigest.cz/upload/file/65770276832.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/89833580765.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/34933140666.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/91494703814.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/94479551962.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134222c13b0e---xuwuladipupanaguxa.pdfIn PDF document text
    • https://tele-video.ru/upload/files/53463625236.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/37476363522.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/ziliv.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/13291969658.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/96877502629.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_off0000c83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83F 10856 bytes
SHA-256: 2d8cf1ccfac24ccf84314d9b3dbb2017364ae71668c5db5217928f0f8a8930b4
font_01_sfnt_off0000e145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 17552 bytes
SHA-256: fbcb8dec6f6e1fa979ba49b62e9c8275a61d959d7e74d9780c86a6edd5c3b2f8

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