Malicious PDF — malware analysis report

Static analysis result for SHA-256 a938e1a0eccf82fb…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 03:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d930d8242ebf439719beed70edcb00d SHA-1: be87db6d229d2c1636260b5311913a82005835a3 SHA-256: a938e1a0eccf82fb6cd2d0e2fe5103168e5f0eec081ff0efac256c259f7efc55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to distribute other files, with numerous links to disposable hosting. While no scripts were directly extracted, the presence of embedded URLs and the link farm heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://norservis.cz/files/files/75712740371.pdf In PDF document text
    • http://anitt.in/ckfinder/userfiles/files/kisukawokapexaki.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/jewobod.pdfIn PDF document text
    • http://freestyler.cz/img/file/49939383635.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/4073721864.pdfIn PDF document text
    • https://invision.buzyhub.com/files/80615519330.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/46922339134.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/dezodibi.pdfIn PDF document text
    • http://pk.mo/userfiles/file/fozizu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466c78e4a50---bamebozakijolaxumi.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/zapafemazejawopi.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/74492669807.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/wojowasobezewiniwuterimet.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/gugumumemerugubisoduseg.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/zuwafimimojir.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/18295410134.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109101951138539.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/donufufadurokuposeleved.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/69810512262.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/poxujize.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/64626639864.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161305b1201513---14890616494.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/kobizujepuzamifu.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/97780603996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dhoom+2+full+movie+in+tamil+dubbed+free+download+hd+1080pPDF 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_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 18664 bytes
SHA-256: 8985baf70ffcc67dcbd43b0d33c788d5808c0fba4f4c41bbda530b6b3371df94
font_02_sfnt_off0001251b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251B 11492 bytes
SHA-256: 6e72359d75d0f063cdf4633cf4bcdecae8f6d94e0e6188756ab241c0a7071fde

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