Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca4d50d5c203b24…

MALICIOUS

PDF

41.0 KB Created: 2020-04-11 01:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1d7140ef491e374a77c4d8aedba97b6f SHA-1: 54f2db29667b69017ea32e3189d356a1ddbd917e SHA-256: 1ca4d50d5c203b24cc455ac975d870d1acbdc949167c2a5288d158c276acdcfb
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which are hosted on domains designed to appear legitimate but are likely part of a link farm for SEO manipulation. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains text related to a 'joint last will and testament template', suggesting a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://dexandra40.com/uploads/1/3/0/6/130603980/130603980.html#joint+last+will+and+testament+template
    • http://itahani.com/uploads/1/3/0/5/130590353/kixujukawupo.pdf
    • http://kalsing.dk/uploads/1/3/0/5/130539297/1063591.pdf
    • http://musictastefm.com/uploads/1/3/0/4/130483682/sofumakepetoduj_fonom_moweluwawoz.pdf
    • http://searchingtheblue.com/uploads/1/3/0/6/130640072/261699.pdf
    • http://verniceartmagazine.com/uploads/1/3/0/5/130589277/suwivazidufin_wonoxujaj_xutujuf_wagofar.pdf
    • http://liquidgoldcorp.com/uploads/1/3/0/4/130483325/94adde.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_off0000783f.bin
def7ced7adefcdb38bccfa3e445d3c64a1c56dbfa3333a9c5254f7ffc465787a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x783F 8340 bytes

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