Malicious PDF — malware analysis report

Static analysis result for SHA-256 a609e32ccef49f12…

MALICIOUS

PDF

74.7 KB Created: 2021-06-09 05:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 188307b9d708d256ffd633a6e1902efb SHA-1: ae280077d117bac74139c28a825a21e162d14355 SHA-256: a609e32ccef49f1217b2eeb08f4cc215070a87156592dd8ea736bcc5aae44909
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on external domains. The primary URL, https://queure.ru/pbw?utm_term=past+modals+of+deduction+exercises+pdf, suggests a lure related to educational materials. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content through the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://queure.ru/pbw?utm_term=past+modals+of+deduction+exercises+pdf
    • https://static.s123-cdn-static.com/uploads/4487665/normal_5fcc5698bb136.pdf
    • https://cdn-cms.f-static.net/uploads/4375075/normal_60501017644ef.pdf
    • https://tuledekubixa.weebly.com/uploads/1/3/4/7/134722649/bomesuzeposiwutatux.pdf
    • https://cdn-cms.f-static.net/uploads/4483873/normal_606aaa061e872.pdf
    • https://static.s123-cdn-static.com/uploads/4486365/normal_5fc90a6e15a50.pdf
    • https://cdn-cms.f-static.net/uploads/4420019/normal_5fda41b799fbc.pdf
    • https://cdn-cms.f-static.net/uploads/4472486/normal_5fd805f339c6c.pdf
    • https://cdn-cms.f-static.net/uploads/4470681/normal_602e027904878.pdf
    • https://dirukarizudabi.weebly.com/uploads/1/3/2/3/132303081/gafela.pdf
    • https://bitifuzafaf.weebly.com/uploads/1/3/4/4/134488734/nibiwatilexemizibase.pdf
    • https://cdn-cms.f-static.net/uploads/4369935/normal_6054cc8b80d66.pdf
    • https://cdn-cms.f-static.net/uploads/4501654/normal_604997c53a1c4.pdf
    • https://cdn-cms.f-static.net/uploads/4488574/normal_603283e39ee6f.pdf
    • https://cdn-cms.f-static.net/uploads/4453908/normal_603997b3e89cf.pdf
    • https://static.s123-cdn-static.com/uploads/4379984/normal_5fee9ebf79982.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kukepofarit.pbworks.com/w/file/fetch/144727140/tokakunu.pdf
    • http://sonubugu.pbworks.com/f/wezodibefo.pdf
    • http://fomebin.pbworks.com/f/48305203218.pdf
    • http://mikabipi.pbworks.com/w/file/fetch/144450561/pirekopukumiges.pdf
    • http://vatojorisa.pbworks.com/f/iphone_auto_clicker_app_no_jailbreak.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e413.bin
4f39d28191348ba071764d1a042925c968ba32858dfb807c84f7048505611723		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 5372 bytes
font_01_sfnt_off0000f648.bin
0a9a6e932b533d357558f73c74d43aeb65bcbcd9ece3d1ef089d37bb2ff5effc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 10948 bytes

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