Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2bd2190aedabd1…

MALICIOUS

PDF

44.0 KB Created: 2020-03-30 02:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b1dcc2d380064d59cd22fb1a83d96aa1 SHA-1: cc8d4b1b583547c84783159abed35404fc1d7a44 SHA-256: 5b2bd2190aedabd1bd6b33ee4b9b5fabb168c964aef7ce76da246cc1023bbbe2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links to various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The primary purpose appears to be directing users to a network of linked PDF files, potentially for SEO spam or to distribute further malicious content.

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://qualitycareafh.com/uploads/1/3/0/7/130775258/130775258.html#que+son+las+palabras+polisemicas+significado
    • http://delwebbatcanebay.com/uploads/1/3/0/7/130776393/rilusawov_zuretizoxa.pdf
    • http://dreamtravelexplore.net/uploads/1/3/0/7/130738700/58efd7f0b840db3.pdf
    • http://webmail.bold-essentials.com/uploads/1/3/0/7/130776726/1307820.pdf
    • http://radioteleprimitiveofyahuah.net/uploads/1/3/0/6/130639563/6697054.pdf
    • http://upsidedownnarwhal.com/uploads/1/3/0/3/130379143/0b274f6a8abdf0c.pdf
    • http://30a-photos.com/uploads/1/3/0/5/130543050/8a28510.pdf
    • http://oaklandsacademy.net/uploads/1/3/0/4/130477110/1b8169e9.pdf
    • http://aarccollections.com/uploads/1/3/0/7/130775725/wibuwolaxadi.pdf
    • http://drjakejackson.com/uploads/1/3/0/5/130589168/bavami.pdf
    • http://3bbabyblankets.com/uploads/1/3/0/2/130272362/faxaliperemukogu.pdf
    • http://elisebrianne.com/uploads/1/3/0/7/130739000/merisivepusagopepat.pdf
    • http://oneactioncalendar.org/uploads/1/3/0/9/130969596/8341701.pdf
    • http://rscbenches.com/uploads/1/3/0/8/130813991/f1945e7e85d00db.pdf
    • http://themeanderingbakery.com/uploads/1/3/0/2/130274281/0337042.pdf
    • http://cherrycreekcheer.com/uploads/1/3/0/4/130476129/193863.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_off00007f8a.bin
a93ba091307c4ab41b417380312d8bc040a0db49e10126836a85ac220ac558d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8A 9348 bytes

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