Malicious PDF — malware analysis report

Static analysis result for SHA-256 02e588445b3e2afd…

MALICIOUS

PDF

53.9 KB Created: 2020-03-09 08:07:40 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ce6dbfd0ab198daaabb0cb843e79d2f1 SHA-1: d9357efca7e3e54747c1aae1dc683d6ddc87dd92 SHA-256: 02e588445b3e2afd414386f6efcca034dd68fd7a937019a209cdbb56f489d673
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, identified by the 'PDF_SEO_LINK_FARM' heuristic. These links point to various domains, suggesting a coordinated effort to distribute content or redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and numerous external links imply an intent to lead users to potentially harmful content or phishing sites.

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://rlunivd.brdge.org/uploads/1/3/0/2/130270986/130270986.html#navodaya+vidyalaya+admission+2018+class+5
    • http://antiguarentalhouse.com/uploads/1/3/0/4/130436166/c90ee0b81afd.pdf
    • http://auroraweddingandevents.co.uk/uploads/1/3/0/6/130639532/6850846.pdf
    • http://mynaturalplayce.org/uploads/1/3/0/4/130435846/17301.pdf
    • http://tsc-landstar.com/uploads/1/3/0/4/130483303/898a10b.pdf
    • http://highdeserttactical.com/uploads/1/3/0/4/130475966/nizelogaw-dogenak-kopis.pdf
    • http://pitwagner.com/uploads/1/3/0/8/130874536/871322.pdf
    • http://mta-sts.magdalenajarecka.pl/uploads/1/3/0/7/130775076/fujor-jugibenupugiliz.pdf
    • http://pjpod.com/uploads/1/3/0/8/130873976/aae5b255dc.pdf
    • http://rambow145.com/uploads/1/3/0/5/130540525/6589745.pdf
    • http://adesse.com/uploads/1/3/0/7/130776716/wujekakinomi_tavip_muzom_piposofomiku.pdf
    • http://stgeorgestucco.com/uploads/1/3/0/6/130605453/gimakopuzokagif_sukerasuputed_kodovesoxuzaket_rivaze.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086c9.bin
a548ac6dcd878eb85060c2207ff706f78ef020d1099b29d3324f2fd9afca7f06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C9 8400 bytes
font_01_sfnt_off0000a6e6.bin
a5cf15f5d99b002bd4f573dad87f54f0bff507c5cf7b63b3129f277766cd2e6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6E6 12536 bytes

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