Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba97d53014d49e1…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 12:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 757b5a4b6b1470576ab3d94ee10ac32b SHA-1: 4cad909bfb6f67b46626fd1bcc39edfa2ed3a79f SHA-256: dba97d53014d49e1c41836b634ef1b1a201569c36ba870410e926f7b512dcbd8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=remap+power+button+android PDF link annotation
    • https://bodegoncriollo.com/userfiles/file/jijixadevela.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613405c18f5e3---lodixikafotoxoxajupirur.pdfIn PDF document text
    • https://davnosti.ru/upload/dujotopetaxozuserom.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109051100362496.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/29602332663.pdfIn PDF document text
    • http://master-br.ru/img/file/natuvamufat.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/tosanojurekibivus.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/sikapibode.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/48031961533.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/10386441786.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/lakaxuramigiribe.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/fudonagemoxewevorudetu.pdfIn PDF document text
    • http://orem.mn/uploads/files/midinamam.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/nawikinovujekiduteb.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/6148655946.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/winekutiguzi.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/66958665131.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/midegakaputavavofevu.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/16021934708.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61386c4fc78d8.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/ranokajabezinuvokulamof.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/lanuxejajo.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/64215115637.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/28953156010.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_off0000d897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD897 17980 bytes
SHA-256: d5c7ac1e1adef106a7d974cef46ef6e5a58371912b3118369cdcab58b8053cd9
font_01_sfnt_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 10712 bytes
SHA-256: ba707c929132cfa9b7d3862a72c70f76bf65bc51b4ff0987c40ee47ae4a5b26f
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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