Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1990303f894200d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 22:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: def1036f8df60f1c92a138541e18c89f SHA-1: a86a785e3c24a28ff139bfa7f3c7ba7c6fd47a14 SHA-256: a1990303f894200d28925a52e1a4f7e5ef2cad10f6f789e36e15067ead6ff2b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous external links, many pointing to unknown or potentially malicious domains, suggesting an attempt to redirect users to harmful content. The PDF structure itself is also noted as a link farm, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.indoorclub-informa.com/boletines/img/file/dolunufaze.pdf In PDF document text
    • http://zubrcup.by/files/files/49239689130.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/xupakitikivejafaj.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/furudomudigef.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/34925630666.pdfIn PDF document text
    • https://seger.cz/userfiles/file/47522066963.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/59939773729.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/puxojujejazose.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/fibunavavidinoxinuni.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/batadesovasonipujopexazu.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/xokanarivuxajezuk.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/dudetajijomigovogodaz.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/98716869911.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1bff4db5145960c0374a82ec6822b326/zezarebosupumufi.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/gifudalokepexovuzobojis.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/23662185209.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/fajadafukewagimukola.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ogl3i9b5arb9jakuihga6bhqs6/nepijiduzilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+appstore+for+androidPDF 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_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 10500 bytes
SHA-256: 8f674cfcb3c2a3728e7fc1971cc85e97d0475d4244c91666bac74f7c6c273b4b
font_02_sfnt_off0001151f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151F 17180 bytes
SHA-256: 52963617f2b656c7f4394dcd0db0596dbeeb01be828d873403956fb81527e4ce

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