Malicious PDF — malware analysis report

Static analysis result for SHA-256 7746bdd7bbeb9640…

MALICIOUS

PDF

31.6 KB Created: 2020-03-29 06:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cfd81a046658b660234448f1b32ce7ec SHA-1: 66db2cafd9bd56c35eaeb73b52330fff24a20d4e SHA-256: 7746bdd7bbeb96404212dd3efc010ca2a04417cf5213fce629cad8b0aeb8d743
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a PDF link farm. The primary URL, http://74-123-77-221.mgwnet.com/uploads/1/3/0/6/130604803/130604803.html#book+report+format+3rd+grade, appears to be a lure for a book report format. No scripts were extracted, but the extensive link farm suggests a malicious intent to redirect users to potentially harmful sites. The ML classifier strongly supports the malicious verdict.

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://74-123-77-221.mgwnet.com/uploads/1/3/0/6/130604803/130604803.html#book+report+format+3rd+grade
    • http://forthegreens.com/uploads/1/3/0/3/130379110/744d718cf107008.pdf
    • http://limo-austin.net/uploads/1/3/0/4/130478110/depibiwikujob-peritin-vokazu-turitawozop.pdf
    • http://www.empresskulture.com/uploads/1/3/0/4/130436166/xufozup-wupojume-nuzovi.pdf
    • http://holypost.biz/uploads/1/3/0/4/130483074/2215221.pdf
    • http://graysraw.com/uploads/1/3/0/4/130483322/basorunegogavituz.pdf
    • http://rusticarrowofnc.com/uploads/1/3/0/5/130543462/8801477.pdf
    • http://glmedics.com/uploads/1/3/0/6/130621947/678287.pdf
    • http://luvlifeaz.com/uploads/1/3/0/3/130323271/9347014.pdf
    • http://diversifyai.com/uploads/1/3/0/6/130639935/e76b6d5805.pdf
    • http://niallparker.com/uploads/1/3/0/7/130740514/gekufaxalu-legeloli-bixaxana.pdf
    • http://www.ojandrews.com/uploads/1/3/0/8/130815482/rixajegi.pdf
    • http://asian-connections.com/uploads/1/3/0/6/130605019/lulone_moxefowiduladis.pdf
    • http://omgevingsboekmabobasis.com/uploads/1/3/0/6/130640018/47cd7603fe18.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_off0000559d.bin
52ea9857bb84ae0f16eb792220568b5495e7c12fd63120dfff2b592a76bc9254		 pdf-font-stream PDF embedded font (sfnt) at offset 0x559D 7012 bytes

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