Malicious PDF — malware analysis report

Static analysis result for SHA-256 851a86eab27bdedb…

MALICIOUS

PDF

70.3 KB Created: 2021-10-04 01:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cbd463cb782f5a4819f50df587ea5b1e SHA-1: 793cc73139e4ead1ddd1652f033d3d50016d47c5 SHA-256: 851a86eab27bdedb459dd6faee46d1680eefd64963c6f9bb912aa85a5dd939c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. While no scripts were explicitly extracted, the presence of embedded URLs and the overall detection suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=fallout+4+power+lines PDF link annotation
    • http://gemmacapitalgroup.com/foto/file/58780770231.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/57903926002.pdfIn PDF document text
    • http://danbikoreansj.com/uploads/files/57438187848.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/27890392175.pdfIn PDF document text
    • http://gaudi.tw/upload/file/subejev.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/76520128121.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/peduxixijibiduxozuneg.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/fiwomiwokujiluwesaboluva.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/14368947985.pdfIn PDF document text
    • https://alev.az/userfiles/file/9639026721.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/20161598697.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/xawewizux.pdfIn PDF document text
    • http://dadesigning.com/daduserfiles/files/72287921467.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/48989227123.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/duxelelit.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/88477030994.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/mogekujowax.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/zixuvaw.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/63695616471.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/pederewosojirufewapozew.pdfIn PDF document text
    • https://tipresentoio.it/images/file/86222385755.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/lewivemerijifevowonuf.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/20193449566.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/52559856220.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/sulegosilizomiremal.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_off0000b15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15D 16596 bytes
SHA-256: 97f64a82e8b845bf8eeba62a2df230a48cf140065716a2a828a076de37ebff2d
font_01_sfnt_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 10488 bytes
SHA-256: e4aeb17094bae5c6d99bd708b85be94e2ca16efa64c6ea9015caf9777d9cc355

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