Malicious PDF — malware analysis report

Static analysis result for SHA-256 995ed7a56a9890e3…

MALICIOUS

PDF

29.5 KB Created: 2020-04-02 09:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e156af594aed55aecb10a29d23c5d6a9 SHA-1: 6f905ad05434096cf73f605d97c93d3423a3752a SHA-256: 995ed7a56a9890e34f1740ac474497b637afeb3b8edd379d5446e1a69ff62277
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The document body contains text related to sorting algorithms and the wkhtmltopdf generator, but the primary malicious activity appears to be the distribution of links.

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://lennoxweb.com/uploads/1/3/0/5/130545396/130545396.html#metodo+de+ordenamiento+insercion+c++
    • http://myequineeducation.com/uploads/1/3/0/4/130435893/96903.pdf
    • http://equityreleasehub.com/uploads/1/3/0/5/130544091/temedop_mubama_giledubuxa_ferumadi.pdf
    • http://extratouchcleaningservice.net/uploads/1/3/0/7/130739603/f076ca2476f.pdf
    • http://iroquoiscountyscholarshipgolfouting.com/uploads/1/3/0/5/130539046/lidolifazegutub.pdf
    • http://endthedeer.com/uploads/1/3/0/3/130323968/91f62af4d81.pdf
    • http://instrin6.com/uploads/1/3/1/0/131070723/6fdaac.pdf
    • http://collagis.net/uploads/1/3/0/8/130874394/9967810.pdf
    • http://radcliffeportfolio.com/uploads/1/3/0/7/130775167/8858747.pdf
    • http://thoabui.com/uploads/1/3/0/3/130313376/3146535.pdf
    • http://solangemassa.com/uploads/1/3/0/5/130542734/8946542.pdf
    • http://mvpinnovations.com/uploads/1/3/0/6/130604579/kuseketenufemumijite.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_off00004d0c.bin
05ff777e8e93c379dac4bc509714bcdbda59458f2ed8d0ca86bb008d93bc8b1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D0C 6908 bytes

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