Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7e835a8d3a6cdd…

MALICIOUS

PDF

98.2 KB Created: 2020-04-12 23:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9174477fef1c45b1ec2827318bcd7447 SHA-1: 46024b1440e11344a07f884c798187cb8bc1c912 SHA-256: 5b7e835a8d3a6cdd991e3faf5b239be3a59d7455a3d00b8bf1cf701fc49de329
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, characteristic of a link farm or SEO spam campaign. The document body, though partially obfuscated, includes a title related to drawing manga and anime, likely a lure to attract clicks to the embedded URLs. The ML classifier strongly indicates maliciousness, and the presence of many external links suggests an attempt to manipulate search engine rankings or drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://threepointbasketball.com/uploads/1/3/1/4/131483078/131483078.html#libros+para+aprender+a+dibujar+manga+y+anime
    • http://honigland.eu/uploads/1/3/0/4/130436450/f7c705ef397d032.pdf
    • http://roblynsapparelcollection.com/uploads/1/3/1/4/131437595/46cb4ebd2d.pdf
    • http://adamscleanin.com/uploads/1/3/0/5/130551375/fixosupumapalur_rugovukanewuku.pdf
    • http://trucknthai.com/uploads/1/3/0/6/130603702/8506309.pdf
    • http://jesserj.com/uploads/1/3/1/4/131453684/kedafuvurizezowab.pdf
    • http://lilacsjoyandgrace.com/uploads/1/3/1/4/131409090/ganikusigol-dejufobuxilile-serosapudobamo-dipuzimulaniw.pdf
    • http://autumncalica.net/uploads/1/3/0/4/130488736/jirexezudinem.pdf
    • http://summasportswear.com/uploads/1/3/1/3/131398431/1913475.pdf
    • http://74-123-78-73.mgwnet.com/uploads/1/3/0/2/130288924/pewawefojovaj_wufilupowevam_firef_kisegumeta.pdf
    • http://advisorsthinktank.net/uploads/1/3/0/4/130476086/932298.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/
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115ed.bin
fb4e9cb12c0d365d8832a6ddb2333522a20481aa14631141082e1b45873aa344
pdf-font-stream PDF embedded font (sfnt) at offset 0x115ED 12596 bytes
font_01_sfnt_off00013e83.bin
f0c4d6d3c3a1dcaf6c35e3bfaaa0df3ff98ee704a68c9281f89e4c79317737be
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E83 8956 bytes
font_02_sfnt_off00015ba5.bin
a64146c16885b9d07e68e4894f15cef4ca1c9f274e526213aee45470f910dba5
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA5 18832 bytes