Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a5a727d80917be…

MALICIOUS

PDF

42.3 KB Created: 2020-03-24 10:00:36 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c6ff60cf3515b27fa6080c4b5dc3b82d SHA-1: 7898675190db78cb82d3f6f0d93e624d7c413fb7 SHA-256: 77a5a727d80917be16c8c7075a330d69a65a6cddc06adcb0d367c1407e644e58
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified as a link farm by heuristics. The document body, though partially corrupted, contains a URL that is also present in the list of embedded links. This suggests the primary purpose is to direct users to a network of websites, likely for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
  • 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://rekazconsult.com/uploads/1/3/0/6/130639514/130639514.html#area+del+pentagono+con+apotema
    • http://livraexpress.ch/uploads/1/3/0/7/130775911/gabudewopolozututoz.pdf
    • http://74-123-76-191.mgwnet.com/uploads/1/3/0/8/130874435/6602523.pdf
    • http://color-off.com/uploads/1/3/0/2/130288542/zakuvoxamet-pedesizavorasen-lupajad.pdf
    • http://johnvthephotographer.online/uploads/1/3/0/8/130874104/zulonezezij-likurewoketati-wepiwesalowa.pdf
    • http://www.terraetrading.com/uploads/1/3/0/6/130621965/8821770.pdf
    • http://micah-stephens.com/uploads/1/3/0/3/130323229/dd7a9.pdf
    • http://hattrickvideo.com/uploads/1/3/0/7/130776366/9176934.pdf
    • http://www.mahakalee.com/uploads/1/3/0/4/130483848/topamexuzoda.pdf
    • http://www.kasperlawnandlandscape.com/uploads/1/3/0/3/130379634/divij-gitulet.pdf
    • http://webmail.owswatercolour.com/uploads/1/3/0/3/130324236/6dfe37.pdf
    • http://sanctifyyourhome.com/uploads/1/3/0/6/130621698/f9072a99.pdf
    • http://wrightmcleod.com/uploads/1/3/0/8/130874570/6780673.pdf
    • http://sweetgrass-ecolodge.com/uploads/1/3/0/2/130274376/493766.pdf
    • http://petmobilegroomingnj.com/uploads/1/3/0/7/130775127/7067341.pdf
    • http://www.tokenizedmtg.com/uploads/1/3/0/6/130621503/954ef9f59dd.pdf
    • http://www.luciangraphics.com/uploads/1/3/0/2/130289734/7f81fea102a50.pdf
    • http://jardinesexecutivetravel.com/uploads/1/3/0/7/130775466/d6a73a73f0a24e0.pdf
    • http://elevenoaksmobilehomepark.com/uploads/1/3/0/6/130639285/2348386.pdf
    • http://www.acomint.com/uploads/1/3/0/9/130969521/a2c3184f8081.pdf
    • http://www.julieandbuddha.com/uploads/1/3/0/6/130620604/7985423.pdf
    • http://kevinbibeault.com/uploads/1/3/0/5/130589297/bafuxetagam.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f98.bin
6ee1dd66959a68fb0513a1a47ec0b8c767afeb742845aab42fd3a00d168696fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F98 8756 bytes
font_01_sfnt_off00008f95.bin
4d9ec2aec8f1ca6bebe1b56492fd55a77bba3a6e98efb76508c1b835d4eb9912		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F95 2860 bytes

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