Malicious PDF — malware analysis report

Static analysis result for SHA-256 1639414f7648891f…

MALICIOUS

PDF

50.1 KB Created: 2020-04-17 07:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 800d012f0f9b700a2624d24bd2560918 SHA-1: fd5c358f673d93a81751885f7e3ba683d56d10eb SHA-256: 1639414f7648891f0cbe74384d3016c3ad1ecc1b3645837fe0c280f3c14a847e
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to seemingly unrelated domains with numeric or generic filenames. This pattern is indicative of SEO poisoning or a link farm used to distribute malicious content. While no scripts were directly extracted, the PDF structure and the sheer volume of external links suggest an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://issseemscience.com/uploads/1/3/1/4/131406519/131406519.html#acanthocereus+tetragonus+pdf
    • http://brandipatterson.com/uploads/1/3/1/4/131407709/01fd2094162d0.pdf
    • http://ritualapothecaryptbo.com/uploads/1/3/1/4/131437285/8412031.pdf
    • http://arizonafitnessspecialists.com/uploads/1/3/0/5/130589345/ad71d84576.pdf
    • http://frsteamgeorgia.com/uploads/1/3/0/2/130288321/7915907.pdf
    • http://scottmemorialcog.com/uploads/1/3/0/7/130776688/basipori.pdf
    • http://kobezakartworks.com/uploads/1/3/0/3/130379126/lemapukuwogu.pdf
    • http://cactiguide.[8]���
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078b6.bin
e932bc13921e9e6dfb6e4656fc011244f0b7167663844ddff526ff1fdb667239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B6 9784 bytes
font_01_sfnt_off00009bd2.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BD2 2652 bytes
font_02_sfnt_off0000a539.bin
f304d5248de4d2d535e11e5a3f00133999c598ccb7ee943f2677ab784214679d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA539 16208 bytes

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