Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfe2b9b6d3c8056…

MALICIOUS

PDF

74.8 KB Created: 2021-09-14 08:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4c116aa0c3e4e931964cc88ea3273b8f SHA-1: 964b0c26d837e078c18f01a443afc85e50c4ebd1 SHA-256: 7cfe2b9b6d3c8056791a59e600909d4c0c05f79ecbbb54a2600750ea8a69bbdf
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 0.9985

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://synerhu.ru/uplcv?utm_term=minecraft+pe+best+addons PDF link annotation
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161353dfb113ec---79024470417.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/58070930008.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/53521628997.pdfIn PDF document text
    • http://domosplast.hu/files/file/37967679857.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/dototomevijiziwawipif.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/61543127673.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/80668650723.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/14597069705.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/20205433959.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/kosorofusakumirozasid.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/vimezozizefijojaximopog.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/18528567384.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/nozilabasikazadux.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/861f9fe6810dcdc228b37f4d0b5e26f4/79916354263.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/dimemavesusabaji.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/96596172105.pdfIn PDF document text
    • http://dentali.cz/files/files/87016844398.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/5038249608.pdfIn PDF document text
    • http://regmac.net/userfiles/files/4569038268.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/joxebivatevuvikuj.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/35265958486.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_off0000c263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC263 10700 bytes
SHA-256: f847101101547b7acce29b2c1472e396f5c725a56b717c1296e9bc95186a483e
font_01_sfnt_off0000dad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 16780 bytes
SHA-256: 9b4b3a46b478330a1642e55d082a56311c5fc1255d14f554933124cb25297efa

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