Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c6471c2002241a…

MALICIOUS

PDF

39.4 KB Created: 2020-04-02 17:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e9703a55eecaac086fefd6d144abeb70 SHA-1: 3ab5c4ef083de66429d70f480d0ae439bca99afb SHA-256: 47c6471c2002241a398e8748bc359acc8d5e533dd9368a76a7ad3917087ff5df
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. The ML classifier strongly flagged this PDF as malicious. The document body contains text related to medical conditions and software versions, but the primary malicious activity appears to be the extensive linking to external domains.

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://yuboip.com/uploads/1/3/1/3/131380592/131380592.html#sustentaculum+tali+fracture+radiology
    • http://houseofcamden.com/uploads/1/3/0/2/130289573/dinanovajuruvekitoxo.pdf
    • http://missiontofarm.net/uploads/1/3/0/6/130604179/53619.pdf
    • http://photovoltaikgefaehrten.com/uploads/1/3/1/3/131380121/farosimim-sobadebox-vunas-bojovotuf.pdf
    • http://justaboutthejourney.com/uploads/1/3/0/4/130483733/4207774.pdf
    • http://allmylove.info/uploads/1/3/0/5/130588289/vifew.pdf
    • http://britmot.com/uploads/1/3/0/8/130873957/499717c1.pdf
    • http://awhistleawaypetcare.com/uploads/1/3/0/2/130271001/gupevavafoto.pdf
    • http://fireflyfieldsprimitives.com/uploads/1/3/0/3/130379462/7dc4c290ba9.pdf
    • http://knowyourworthqueen.com/uploads/1/3/0/7/130776416/faromemoj-nanupusodebiwur-mekoverog-fexisadoruxix.pdf
    • http://nethstore.com/uploads/1/3/0/4/130435987/cf0c7.pdf
    • http://bittersweetcocktails.com/uploads/1/3/0/9/130969728/2312882.pdf
    • http://mywerxs.com/uploads/1/3/0/4/130488251/6851269.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_off00007429.bin
3bcf5d70846dc6688c328b6bb9ecb474273026406a0f7c00edc670966f2708de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7429 7292 bytes

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