Malicious PDF — malware analysis report

Static analysis result for SHA-256 16da7e4b2d4dfab6…

MALICIOUS

PDF

38.9 KB Created: 2020-04-12 12:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7c5fc5cae581be40ed69ff72b6839b75 SHA-1: d0fbb836511526169ddfc131e5265fab97aa25c3 SHA-256: 16da7e4b2d4dfab63612d533c84e94bc5145656d7fc0d515f45f2ca2f85bde77
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a tactic to manipulate search engine results or redirect users to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of many embedded URLs points towards a phishing or spamming campaign.

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://the-whole-thing.com/uploads/1/3/0/6/130603760/130603760.html#como+leer+planos+electricos
    • http://janeemontelongo.com/uploads/1/3/0/6/130621413/fotisopijawowesegoto.pdf
    • http://isakkdesign.com/uploads/1/3/0/3/130379287/zozoku-rakibiwe-kopixunegujanig-xelezak.pdf
    • http://asociaciondepastores.net/uploads/1/3/0/6/130639235/3641254.pdf
    • http://sheillanjoto.com/uploads/1/3/0/7/130740199/vajusi.pdf
    • http://kitcheneightyeight.com/uploads/1/3/0/6/130605111/nemewutevevavuf.pdf
    • http://satellitegardens.org/uploads/1/3/1/1/131164223/gusuwipinixud-bobigutobodog-wajovufili-bakodexurugavik.pdf
    • http://sawcuttingphoenix.com/uploads/1/3/1/3/131382539/fejaf-xugozofapijusaz.pdf
    • http://pictureperfectpie.com/uploads/1/3/0/5/130589032/tenelefisituk-tolaxaxale-pufiwomoparo-vadag.pdf
    • http://findcars.fr/uploads/1/3/0/9/130969703/gikewidife.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_off00006ffb.bin
35b9af5529c883baebaec8ae2cea4348ef7502039464a5e45638fc296aa40029		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFB 8768 bytes

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