Malicious PDF — malware analysis report

Static analysis result for SHA-256 176ed7c3de7befbb…

MALICIOUS

PDF

46.2 KB Created: 2020-04-24 05:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1f6d634cadceec0f6cf221417644c12c SHA-1: af43127a43c865660a9f654bdc5b2548a5e5775b SHA-256: 176ed7c3de7befbbff40c3c3c981b143b8a4f0ac0f06f338c4e52cede7354788
96 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 link farm, directing users to various domains. The ML classifier strongly indicated maliciousness, and the presence of numerous URLs suggests an attempt to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious campaign.

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://arcadiagardensllclandscapinganddesign.com/uploads/1/3/0/7/130738997/130738997.html#b+v+g+full+form
    • http://bulletinsusa.com/uploads/1/3/0/5/130543466/lazufuwopefexej.pdf
    • http://thedowntowndoowop.com/uploads/1/3/0/9/130968912/5e3dc1548c3f336.pdf
    • http://jazzstronomie.com/uploads/1/3/1/4/131453321/5062595.pdf
    • http://ensurefg.com/uploads/1/3/0/6/130621036/9cec1302390ea.pdf
    • http://miruviewphotography.com/uploads/1/3/1/3/131381555/1735880.pdf
    • http://allmanufacturingpersonnel.com/uploads/1/3/1/3/131379294/9092722.pdf
    • http://topaz-gem.com/uploads/1/3/1/1/131164425/kifukizija.pdf
    • http://precisionelectrician.com/uploads/1/3/0/6/130620240/3d15b098d.pdf
    • http://avantconsultinggroup.com/uploads/1/3/0/7/130775271/5c9f5f.pdf
    • http://dickstotrump.com/uploads/1/3/1/1/131164109/fuvuzufu.pdf
    • http://weaverpaving.com/uploads/1/3/0/5/130539810/6e7d2e95ccf.pdf
    • http://menallenfriends.com/uploads/1/3/1/4/131407767/taluleke-niteditotive-dogojifulamena.pdf
    • http://howtobeatobamcare.com/uploads/1/3/0/6/130621524/6187578.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070a4.bin
355aba0e862ba93e18dd38144302121f10d2a395b61ce8df6df55e8033ec69d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A4 10220 bytes
font_01_sfnt_off000093a7.bin
1dff76fe1d9bf4e7b54c8c2db6377bbfa915b1d99dc46f88016d89b6830b463b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93A7 17208 bytes

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