Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bb0d233bfb25a3…

MALICIOUS

PDF

131.7 KB Created: 2021-06-01 06:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f167cbd53d886ff25cd4a5ebd0886ddf SHA-1: 5a83f4d89ac33d524ec5e812a88c3d339957d75e SHA-256: d4bb0d233bfb25a33df2efe182bcec5e1777803ec977f0c2d1522411170700cf
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9984

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cructi.ru/pbw?utm_term=cardfight+vanguard+simulator+game PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450260/normal_5ffd689b7f209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_60430341d0b28.pdfIn PDF document text
    • https://xubivolimoba.weebly.com/uploads/1/3/0/7/130740090/zoxituf-nurivipanoner-jatowa.pdfIn PDF document text
    • https://luxapojago.weebly.com/uploads/1/3/4/3/134327771/5191844.pdfIn PDF document text
    • https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/6853661.pdfIn PDF document text
    • https://vavirewafikeja.weebly.com/uploads/1/3/4/4/134402836/jebuxote_zaluxareluzu_duramun_guwakafilim.pdfIn PDF document text
    • https://xuvuvigaxopezut.weebly.com/uploads/1/3/4/7/134721928/6113138.pdfIn PDF document text
    • https://zubarozikagix.weebly.com/uploads/1/3/4/7/134760469/nonofadibi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446759/normal_600d8a930c133.pdfIn PDF document text
    • https://nodeseverew.weebly.com/uploads/1/3/5/3/135323512/dinibiliba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370072/normal_5fc94bcd386f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_606946205b479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_606c82c9acd1d.pdfIn PDF document text
    • https://josudirojupa.weebly.com/uploads/1/3/4/7/134729494/0b0a12b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_605b20c400a52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458144/normal_60198c5d885c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491432/normal_5ff0f0aea656f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484365/normal_60258349e96a9.pdfIn PDF document text
    • https://ledunadexaw.weebly.com/uploads/1/3/0/7/130775166/gajotile-gutejegudojul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://godekazonigi.pbworks.com/w/file/fetch/144432831/8_ball_pool_unlimited_guideline_tool_apk.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144436545/last_cloudia_how_to_get_fairies.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16962 21840 bytes
SHA-256: f674f271a4d5428cc38deec0eef703359e2f152e519bc8f30803d74452883c6d
font_01_sfnt_off0001aea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEA2 5284 bytes
SHA-256: 45df6bd08909a36bab5093b97526ea495e9c90abbc808121d7afc44f17a52515
font_02_sfnt_off0001c07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C07C 12272 bytes
SHA-256: f34702303c3b9576fbd21d9bd3cee6123c8a48142f2ff3b812c7b6b0af0745e7
font_03_sfnt_off0001e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8DC 16244 bytes
SHA-256: 255e02ae07c982174dd2d77cd8386f062619743913f645035cd7e9e0019995aa