Malicious PDF — malware analysis report

Static analysis result for SHA-256 968ef1151f86526c…

MALICIOUS

PDF

37.2 KB Created: 2020-04-10 08:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f95726e33b8f5da6ee70e3819331a04d SHA-1: 26b52e305aeeeb1343fdcca7acfc34ebf49a8930 SHA-256: 968ef1151f86526c24688bc5aa14c81e17eae8aa3788fb893f84e5c441424a3c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified as a link farm. The primary URL points to a page with Spanish text about calculating the volume of a pentagonal pyramid, likely a lure. The heuristic PDF_SEO_LINK_FARM indicates a mass of external PDF links, suggesting a distribution mechanism for further malicious content. No scripts were extracted, but the structure strongly suggests a phishing or content distribution attack.

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://thebusinesstip.com/uploads/1/3/1/6/131606211/131606211.html#formula+para+calcular+el+volumen+de+la+piramide+pentagonal
    • http://computer-technology.org/uploads/1/3/0/6/130604948/9980983.pdf
    • http://entrepreneursover50.com/uploads/1/3/1/4/131483001/999074.pdf
    • http://churchleaderswithkids.org/uploads/1/3/0/6/130604806/bikejaragibejodim.pdf
    • http://morgane-claudine-laurent.com/uploads/1/3/0/5/130550750/9781006.pdf
    • http://glwwnet.com/uploads/1/3/1/0/131070375/3174331.pdf
    • http://pilsenopenstudios.com/uploads/1/3/0/4/130483376/c52f133cf26d882.pdf
    • http://tunetownchildcare.com/uploads/1/3/0/7/130775835/6d6de39c0276f67.pdf
    • http://elvesofftheshelves.com/uploads/1/3/0/7/130775053/mubosufika_zipebam.pdf
    • http://sosoglammed.com/uploads/1/3/1/3/131382583/2626414.pdf
    • http://klassykinks.net/uploads/1/3/1/4/131406709/144043.pdf
    • http://worldclass.blog/uploads/1/3/0/6/130639939/duzuvise-peramodukakogip-votesogi.pdf
    • http://rozelcruz.com/uploads/1/3/0/7/130739146/7280395.pdf
    • http://womeninspiringwomen.ca/uploads/1/3/0/7/130740492/josimavikewureb.pdf
    • http://santo-plastic-mold.com/uploads/1/3/0/6/130639621/xozuzafa.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_off0000666c.bin
6182eba060e8a8787f155fceaa181b2a7be279c43451a1deca3e7fac2339568e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x666C 8372 bytes

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