Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d719ee3eee584e2…

MALICIOUS

PDF

74.8 KB Created: 2021-04-05 00:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbf20c2edf180f58980a0aad65b57a16 SHA-1: 566a24affaa890ab8e6730925544d70ef9d6ccd3 SHA-256: 9d719ee3eee584e2ee812087177968094a6cc19d1ee06fded9f746b8f6375f25
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or content distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/wix?keyword=4-1+identifying+linear+functions+worksheet+answers
    • https://wiwupaluw.weebly.com/uploads/1/3/1/6/131606778/882cb6c6c.pdf
    • https://cdn.sqhk.co/fawabanof/hjjjiiq/83735275985.pdf
    • http://xisumagogali.getenjoyment.net/rurojedetiwodimanewun.pdf
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/2534624.pdf
    • https://cdn.sqhk.co/tosijoxopum/4jw8IjH/zodabizoloxekafodigil.pdf
    • https://wagemerefav.weebly.com/uploads/1/3/2/7/132712282/dazanosobujofevavom.pdf
    • https://cdn.sqhk.co/leporolino/c4jghjQ/archers_battle_of_hastings.pdf
    • https://gorofegi.weebly.com/uploads/1/3/4/4/134462705/eb1571739.pdf
    • https://bazuxenulasiv.weebly.com/uploads/1/3/0/7/130740357/39b24.pdf
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/xupitare.pdf
    • http://supariwepexafat.mywebcommunity.org/zojoget.pdf
    • http://jifixadilo.22web.org/32757724635.pdf
    • https://bujubupe.weebly.com/uploads/1/3/1/4/131437121/momoxugodisuja-titalavibiwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zupitatip.atwebpages.com/fusujezedib.pdf
    • https://s3.amazonaws.com/welanisowari/28530507202.pdf
    • http://dudibagigop.rf.gd/lafagubinanivuwunogabuxej.pdf
    • https://s3.amazonaws.com/nezanurugega/bedudonozezeme.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_off0000e5ad.bin
bd1eed1ff6ae5ca7636fd820f00ca6b5f7bc0c614a0355a042526db879d820b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 5620 bytes
font_01_sfnt_off0000f8f8.bin
a5f373d41f758483b068532d87dc832efa3750665538093c8e70667e0fa5eef7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 10892 bytes