Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88cbaa0b204d3a2…

MALICIOUS

PDF

43.8 KB Created: 2020-05-23 22:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8cf41ea495b5a7a487d866584b5b342 SHA-1: 6805e94b38165b1f7a2b711e4297a35d06dbce91 SHA-256: c88cbaa0b204d3a2e670142f7fd84918c59841924f4bd1244f49e40b5692fc78
94 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, embedding a large number of external URLs. The heuristic PDF_SEO_LINK_FARM specifically identifies this pattern, suggesting the document's primary purpose is to direct users to a network of potentially malicious websites. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://hypnose-kinderwunsch.com/uploads/1/3/1/4/131406681/131406681.html#high+tail+hall+twilight+cavern
    • http://getcerakoted.com/uploads/1/3/1/3/131380163/tigogewozifab_lavedexidugu.pdf
    • http://bakerassociatesinc.com/uploads/1/3/0/5/130539645/9561106.pdf
    • http://crystalclearing.com/uploads/1/3/0/4/130435844/721eed286d.pdf
    • http://platinummemorial.com/uploads/1/3/1/4/131438495/3434320.pdf
    • http://theconnectgoddess.com/uploads/1/3/1/4/131455283/031398309.pdf
    • http://yogaatschools.org/uploads/1/3/0/7/130775992/bb3259a68c0bdf.pdf
    • http://heilalagarcia.com/uploads/1/3/1/4/131438180/367e95801b3.pdf
    • http://hotelbuyouts.com/uploads/1/3/1/8/131871532/lerarofogerirax.pdf
    • http://host159.carmichaelnl.com/uploads/1/3/0/5/130588943/8549815.pdf
    • http://conorfirth.com/uploads/1/3/0/4/130489226/9044154.pdf
    • http://ectaylorlaw.com/uploads/1/3/0/4/130483673/dabugez-judim-kunumalug.pdf
    • http://sukkahshade.com/uploads/1/3/0/4/130476180/2585733.pdf
    • http://webmail.highbyte.com/uploads/1/3/0/4/130490410/rotuwamo-vulot-sosikijofuzo.pdf
    • http://globalchemtradellc.com/uploads/1/3/0/6/130620632/powelo-dunire.pdf
    • http://arapahoepainting.com/uploads/1/3/1/4/131437307/b510fed78d2.pdf
    • http://goodmovespilates.com/uploads/1/3/1/3/131379409/fifokusazolopet.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_off00007dd2.bin
1fedba8e41bd6f5014fd52bc99599a883a39af14aa59522fc0b72c78b283927b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD2 11856 bytes

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