Malicious PDF — malware analysis report

Static analysis result for SHA-256 121d607caea4dc63…

MALICIOUS

PDF

32.7 KB Created: 2020-05-15 22:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3e4b2bdb75d0effa102d2c107ee1678 SHA-1: d4977c2d44342a1a76b2265ca63af646c98fde60 SHA-256: 121d607caea4dc637ea870efc906ef49ca015398afdca368684815bcb02d9130
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs likely lead to further malicious content or are part of a link farm to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://thebusinesstip.com/uploads/1/3/0/4/130483215/130483215.html#hungry+shark+evolution+world
    • http://upperdare.com/uploads/1/3/0/9/130969862/4d0e6ea5487.pdf
    • http://christerica.org/uploads/1/3/0/7/130739399/2cc57a868673c5.pdf
    • http://infiniteproperties.org/uploads/1/3/0/7/130774966/ef883.pdf
    • http://loyalcapitalinvestment.net/uploads/1/3/0/6/130639949/ab202fd53b.pdf
    • http://stagedoortheatreok.com/uploads/1/3/0/2/130289236/eceab78.pdf
    • http://thecatwalkblog.net/uploads/1/3/1/4/131482823/60d3bab.pdf
    • http://alpharcg.com/uploads/1/3/0/4/130491253/4571167.pdf
    • http://thekentones.com/uploads/1/3/0/6/130604981/tibowisebapub_xebulizete.pdf
    • http://tagwalk-creative.com/uploads/1/3/0/6/130621284/c9dcda37.pdf
    • http://wholesalemichiganhomes.com/uploads/1/3/0/9/130969586/tatirojoxan.pdf
    • http://zumitzeta.com/uploads/1/3/0/3/130324292/3cc3de3b8322.pdf
    • http://whatisinnovationtoyou.org/uploads/1/3/0/6/130639659/mafoworo.pdf
    • http://fedortruba.ru/uploads/1/3/0/5/130588611/firavabewisuza.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054bf.bin
251ba5269847d3f5449f2e506b15d3901d83ba7503af1ddaee48081633b10d7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54BF 10176 bytes

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