Malicious PDF — malware analysis report

Static analysis result for SHA-256 745499b4089c0068…

MALICIOUS

PDF

37.3 KB Created: 2020-05-18 00:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0c999eb9afaef25cc7e3441c24ec179 SHA-1: c4f5682a31b85868035a323a2d297526a56e8bc5 SHA-256: 745499b4089c0068c55ca67d9ea92272758987075b4e76b71bf5aa0171c0455b
136 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The ML classifier strongly flagged this PDF as malicious. The embedded URLs likely lead to further malicious content or phishing pages, suggesting a spearphishing attachment as the initial attack vector. No scripts were extracted, but the sheer volume of outbound links indicates a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://katiaponomareva.com/uploads/1/3/0/7/130776402/130776402.html#china+animal+husbandry+group+annual+report
    • http://christinareid.net/uploads/1/3/0/4/130488506/kikekidemagafolidew.pdf
    • http://danacurle.com/uploads/1/3/0/7/130739938/xosope-vuzoxepudapu-navobufivugudu.pdf
    • http://redemptionclean.com/uploads/1/3/0/7/130776626/ef01d11c38.pdf
    • http://thefinalbow.com/uploads/1/3/0/5/130590456/zetoxom-xufabexelo.pdf
    • http://lamgidesong.com/uploads/1/3/0/9/130969552/mefajaxusut.pdf
    • http://memoriesandstuff.com/uploads/1/3/0/7/130775118/luluzolax.pdf
    • http://inoutinvestmentsllc.com/uploads/1/3/1/4/131483343/gevukid.pdf
    • http://betterthanb4furniture.com/uploads/1/3/0/4/130435555/tiberezaxa.pdf
    • http://qualityaconstruction.com/uploads/1/3/0/6/130639077/d407fdd4.pdf
    • http://smartbizmodel.com/uploads/1/3/0/3/130323703/tapomo-nugeruga-rijazen.pdf
    • http://gettyssportsmassage.com/uploads/1/3/0/5/130588907/2746249.pdf
    • http://my-lose-fat.com/uploads/1/3/0/2/130270899/579530.pdf
    • http://studiopearlman.com/uploads/1/3/1/1/131164394/vuvamesekupasisuwubu.pdf
    • http://reelbrothersbassn.com/uploads/1/3/0/5/130590567/6817835.pdf
    • http://mdtinc.net/uploads/1/3/0/6/130621765/nunalupibude.pdf
    • http://conflictresolutionnw.com/uploads/1/3/1/4/131453018/cd13f3b527b3f63.pdf
    • http://stamfordcreditrepair.com/uploads/1/3/0/3/130313212/f852084f8.pdf
    • http://nolagirlcustomcreations.com/uploads/1/3/0/5/130539130/fc317157d.pdf
    • http://diypoolsoftexas.com/uploads/1/3/0/6/130604687/3923233.pdf
    • http://theacollection.org/uploads/1/3/1/3/131384771/digezoruferukuxamidu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066aa.bin
99d00a2b7e2c415340308111299ecaf56103deda46b8db4e48810cdedd498bf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66AA 10120 bytes

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