Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34b7e11bf34a41a…

MALICIOUS

PDF

39.4 KB Created: 2020-03-24 19:48:06 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bd4c5615e22f4b7a9ffa30b89380aadc SHA-1: a03f9087c28b8e32fe4a981ce6171219315dcb0a SHA-256: c34b7e11bf34a41ac8adc87976f6a9de7f1d7164f8297bab2909cba92dbd7446
92 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 domains. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. The document body, though partially corrupted, contains text related to chemistry questions and authoring application details, suggesting a lure to disguise the malicious link distribution. The primary attack pattern involves directing users to a vast network of external PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://mrheff.com/uploads/1/3/0/5/130539842/130539842.html#shapes+of+molecules+a+level+chemistry+questions
    • http://merlotandamovie.com/uploads/1/3/0/5/130588790/vepuzumusetukebufo.pdf
    • http://employlanguages.com/uploads/1/3/0/2/130274291/f0fa7c48f0.pdf
    • http://velobristol.com/uploads/1/3/0/5/130590458/1410086.pdf
    • http://veeravelmanivannan.com/uploads/1/3/0/6/130621576/rirekaregu_mitozefav_besopevaxuvo_kafadak.pdf
    • http://gigzrus.com/uploads/1/3/0/3/130312953/gisiruluxoweni.pdf
    • http://inversefootwear.com/uploads/1/3/0/3/130313173/9657080.pdf
    • http://styer-fitzgerald.org/uploads/1/3/0/5/130588674/ef453.pdf
    • http://millscollisioncenter.com/uploads/1/3/0/8/130813630/javozusuk.pdf
    • http://mylureclaim.com/uploads/1/3/0/8/130814338/fevumatoramumiwex.pdf
    • http://mx.hacd.org/uploads/1/3/0/7/130739618/wukabatejifizux.pdf
    • http://flemingfilms.com/uploads/1/3/0/6/130620751/toxuradosajuzizima.pdf
    • http://mybluejeansbookkeeping.com/uploads/1/3/0/7/130740149/sinopuzugavof.pdf
    • http://medquipltd.com/uploads/1/3/1/0/131070792/wijovarisirode.pdf
    • http://www.jonoma.net/uploads/1/3/0/7/130740374/dijakerepig.pdf
    • http://www.epeecow.com/uploads/1/3/0/5/130542769/dajofuse_dafurugek.pdf
    • http://savhandyman.com/uploads/1/3/0/3/130323513/botexi-jakasibaxutoz.pdf
    • http://symbolforschung.net/uploads/1/3/0/7/130739662/4607893.pdf
    • http://opportunitesante.com/uploads/1/3/0/7/130775776/daguwaviju.pdf
    • http://kabadventures.com/uploads/1/3/0/7/130739267/gatizomewofipuzomawu.pdf
    • http://qhsindy.com/uploads/1/3/0/5/130588318/mivojuf.pdf
    • http://hostmaster.portfields.org/uploads/1/3/0/7/130740589/2480680.pdf
    • http://www.funkytownpedicab.com/uploads/1/3/0/2/130270931/wadamurumatupuv.pdf
    • http://www.tfsonorientation.com/uploads/1/3/0/9/130968915/6120011.pdf
    • http://blueraspberryscarves.com/uploads/1/3/0/6/130621301/1492936.pdf
    • http://northwalestimberframes.com/uploads/1/3/0/7/130740191/maxowanesizimu-sobeli-kawexilepedepa.pdf
    • http://blueraspberryscarves.com/uploads/1/3/0/6/130621301/149
    • 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_off00007094.bin
15e35e7c6b8a4e39029776f3c4807763370b30efa9666057908e6fc1a2b09a95
pdf-font-stream PDF embedded font (sfnt) at offset 0x7094 7948 bytes