Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db89d562157c6d5…

MALICIOUS

PDF

41.9 KB Created: 2020-03-21 02:21:10 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d47f818ca69e1cb173a244357e1a8632 SHA-1: 7c7539ac4b519c307125e26adffb7e46331ae794 SHA-256: 6db89d562157c6d57d1b922ce3c7222812d2da768ec79e3c20c797144f2df5e6
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF SEO link farm. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains URLs that are likely used to redirect users to malicious sites or for SEO spamming purposes. No scripts were extracted from this sample.

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://armorgrind.org/uploads/1/3/0/7/130775629/130775629.html#goodnight+mister+tom+character+quotes
    • http://peterstownshipgolf.org/uploads/1/3/0/8/130874073/bba19762a79.pdf
    • http://superbdave7771and1.com/uploads/1/3/0/7/130775374/a1f0972962a440.pdf
    • http://www.sneakersurbanonline.com/uploads/1/3/0/4/130488172/7c1699c62.pdf
    • http://www.thswebpages.org/uploads/1/3/0/2/130272853/lirofowi.pdf
    • http://technologiedag.com/uploads/1/3/0/4/130489522/de94aeb6b1.pdf
    • http://www.irvineky.net/uploads/1/3/0/8/130874520/gupekododex.pdf
    • http://onlinenursingdegrees.net/uploads/1/3/0/7/130775971/5761147.pdf
    • http://autodiscover.shepherdssecurity.com/uploads/1/3/0/3/130323141/06a8d90d5e61ee8.pdf
    • http://rumseytownhall.com/uploads/1/3/0/2/130288761/gifepom.pdf
    • http://imothmarschen.de/uploads/1/3/0/9/130969440/jijel-mexizov-wasugaxez.pdf
    • http://aandeapothecary.com/uploads/1/3/0/6/130620233/906a04be3ac.pdf
    • http://puretranquility.net/uploads/1/3/0/3/130323235/zagevoxot_pexogiri_lekomisizadosam.pdf
    • http://jacquescampfineart.com/uploads/1/3/0/9/130969551/lusijurojun_jakixivasu_nufiz.pdf
    • http://rccollegeconsultants.com/uploads/1/3/0/2/130289632/6911036.pdf
    • http://www.jsallnaturals.com/uploads/1/3/0/5/130588529/povagita.pdf
    • http://runcrozet.com/uploads/1/3/0/6/130604549/bafupenununurovuriwa.pdf
    • http://www.thejonellaqueen.com/uploads/1/3/0/8/130874583/ruwezonizunefupuxata.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_off0000790f.bin
0fcb38dfae06cba9ad05f2a110288d2609cd03443e8f59a0bab0957f29cdf7d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790F 8156 bytes

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