Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b243d028f92ef2…

MALICIOUS

PDF

38.9 KB Created: 2020-05-19 11:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c52a9cc0c112107cab6d36aa5290d390 SHA-1: 3bcde02523ea528ecd7e57211e2d7f647f538dd2 SHA-256: 49b243d028f92ef2c76abee7ce9f75257d73555a0f040c7f58724947a3ca3277
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF is identified as malicious by ClamAV and an ML classifier, indicating it's a dropper. The document body contains a lure related to "cooking merit badge pamphlet download" and numerous external links to other PDFs hosted on various domains. The presence of a PDF link farm suggests a campaign to distribute further malicious content, likely leading to malware execution.

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.
  • ClamAV: Pdf.Dropper.Agent-9538235-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9538235-0
  • 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 http://yieldqwest.com/uploads/1/3/0/5/130539928/130539928.html#cooking+merit+badge+pamphlet+download
    • http://drugfreenorwood.com/uploads/1/3/0/5/130539678/zugesebodusu_zetowoje.pdf
    • http://leaphy.online/uploads/1/3/0/8/130874613/4599ad22.pdf
    • http://hadleyk.com/uploads/1/3/0/6/130621995/8986234.pdf
    • http://hobmeierphotography.com/uploads/1/3/0/5/130539105/foxuw_zevosurava_favozoje_dozeg.pdf
    • http://garyfowliemedia.com/uploads/1/3/0/9/130969631/mowum.pdf
    • http://chosenally.com/uploads/1/3/0/3/130313561/favar-wasusinomalin.pdf
    • http://keys2balance.org/uploads/1/3/0/4/130488975/2926761.pdf
    • http://szambabetonowe-poznan.pl/uploads/1/3/1/3/131398066/wutaj-pomugeduruw.pdf
    • http://pebbleyoga.com/uploads/1/3/1/4/131453915/3467105.pdf
    • http://derekjohnson3d.com/uploads/1/3/1/4/131453076/lonatetaradegek-vanale-luraxiti-zuzoxovekivuga.pdf
    • http://mochamagicmodesto.com/uploads/1/3/0/6/130605517/pozoj.pdf
    • http://westerncanadasolar.com/uploads/1/3/1/6/131606612/8594421.pdf
    • http://zionstone.us/uploads/1/3/0/7/130739375/jekakipusupisux.pdf
    • http://masterdoeuvre.com/uploads/1/3/1/3/131379496/wizenirodojefofowe.pdf
    • http://zg-yang.com/uploads/1/3/0/8/130874328/sixunixu-segokabajozu.pdf
    • http://ashtaashram.com/uploads/1/3/1/4/131453818/5d0b90cb8f0.pdf
    • http://musiquesaucoeur.com/uploads/1/3/1/4/131438305/6335813.pdf
    • http://stonybrookgenealogy.com/uploads/1/3/1/3/131398020/4801906.pdf
    • http://bestwalnutcreekhandyman.com/uploads/1/3/0/7/130738716/nabiv.pdf
    • http://act-as-one.net/uploads/1/3/0/6/130620640/juzasixosujemudela.pdf
    • http://thesiswriteup.com/uploads/1/3/0/2/130271017/08355e.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b5a.bin
1abf062afe0db479ddaf1a8636f159a450fd062b209e35b05e4ddc837331d364		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5A 10568 bytes

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