Malicious PDF — malware analysis report

Static analysis result for SHA-256 152a6177bd9ac6b2…

MALICIOUS

PDF

29.0 KB Created: 2020-04-26 00:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f620bd675fd0586771bc803e5bf7fc8b SHA-1: 854b593c5e2c528ed497831850a5890a32efac4e SHA-256: 152a6177bd9ac6b2c665ef4976e23e2d210d32decc8f81dbb78bc673caa97483
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution network. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a tactic to manipulate search engine results or to serve as a gateway to 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://skinspiritlife.com/uploads/1/3/1/4/131484603/131484603.html#hidden+alphabet+games+free+online+no
    • http://embodiedliving.info/uploads/1/3/0/6/130604243/batevigudedodo_tebajuzume_fopitax_boveka.pdf
    • http://davieapartmentrentals.com/uploads/1/3/1/4/131452823/lulafonibiriz-fapile-tomanevez-kinugiwep.pdf
    • http://kentkilpatrick.com/uploads/1/3/1/4/131453858/d14b8e0c2d.pdf
    • http://garyzancanelli3.com/uploads/1/3/0/6/130639511/xutevimasijok.pdf
    • http://daniel-pascual.com/uploads/1/3/1/3/131379447/wijub.pdf
    • http://sweiver.com/uploads/1/3/0/7/130739830/xubimosig.pdf
    • http://christyolsenfineart.com/uploads/1/3/1/0/131070161/3305208.pdf
    • http://cyclingplanner.net/uploads/1/3/0/4/130436121/48149.pdf
    • http://thesupremeparty.com/uploads/1/3/0/4/130483355/8c4c9d0f0a.pdf
    • http://fpcoffeeclub.com/uploads/1/3/0/9/130970023/3b4feb8.pdf
    • http://endkillerwhalecaptivity.com/uploads/1/3/1/0/131070925/gokesabeta_fupilutege_maxeratujabu.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_off00004bd8.bin
843a44ddadc86b0450c29eacfaa2c5c91faf6a1ce13ea7918145c8e3c092bb28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BD8 7068 bytes

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