Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edac36877a69930…

MALICIOUS

PDF

46.0 KB Created: 2020-03-15 07:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f15926c857a0c5abf382ab6be5b35194 SHA-1: 5c89264ab6497276cd2c0b51362fda22b02a35c9 SHA-256: 9edac36877a6993090f4e25457d14a709739c5022ce15ac5e55fcac595e5924e
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The embedded content, though heavily obfuscated, includes URLs pointing to various domains, suggesting a link-farming or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a multitude of external PDF resources.

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://andmerchant.org/uploads/1/3/0/2/130272977/130272977.html#jcl+quick+guide+tutorialspoint
    • http://boutiqueofisanti.com/uploads/1/3/0/2/130292110/mitamiras-zupol-wijori-nejoduba.pdf
    • http://mechanicalflower.net/uploads/1/3/0/6/130620928/5091302.pdf
    • http://p4rti4ls.ltd/uploads/1/3/0/5/130589374/bavun_bemexarubi_xojisameg.pdf
    • http://ludwikearthworks.com/uploads/1/3/0/5/130550976/getajulivopabewarene.pdf
    • http://www.clamagorereef.com/uploads/1/3/0/5/130590700/e03e8cdfea.pdf
    • http://localseonyc.net/uploads/1/3/0/6/130620970/2632500.pdf
    • http://quaysidecottage.net/uploads/1/3/0/3/130324065/9326445.pdf
    • http://stadisonsstitches.com/uploads/1/3/0/9/130969183/bef5eee.pdf
    • http://misguidedinthemagnolia.com/uploads/1/3/0/7/130776716/xegar-zawemu-gofopegokinin-ropimuxunepiru.pdf
    • http://mollysides.com/uploads/1/3/0/5/130541662/seliliriwola.pdf
    • http://www.espiha.com/uploads/1/3/0/5/130547286/xowelisodutomokavufo.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_off00008be6.bin
df3f9b3427323f83d83c908d189b2e103e886733ad020c65fd6485c1cd4518ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE6 8164 bytes

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