Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ae20d8724c8649…

MALICIOUS

PDF

29.6 KB Created: 2020-04-06 13:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fd5b4687aa74d9ba0621bdb0e54b7f1f SHA-1: 3db89333501ac05ebded891891267e21f05775d3 SHA-256: 90ae20d8724c8649b741fbc962e86d10fcaf07ad2e1888961b0a25a909c612eb
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or a distribution network. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are also present in the heuristics, reinforcing the link-farming or distribution attack pattern.

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://carpetcleancary.com/uploads/1/3/0/6/130639647/130639647.html#huntington+mall+theatre+showtimes
    • http://hoonehooldus.com/uploads/1/3/0/8/130874338/wiwilofo.pdf
    • http://cummingtreeservice.com/uploads/1/3/1/1/131163550/gofifu_nubuso_jenapofof.pdf
    • http://bigislandsolarenergy.com/uploads/1/3/0/7/130775232/2536166.pdf
    • http://kameronchristian.com/uploads/1/3/0/8/130874608/6519204.pdf
    • http://fizziqueshop.ca/uploads/1/3/0/2/130291588/941319231843.pdf
    • http://pycdrafting.com/uploads/1/3/1/3/131383838/sukorewikudilidavozo.pdf
    • http://utilimetrics.com/uploads/1/3/0/6/130640107/dabowile_tovalakakoled.pdf
    • http://aceeoptical.com/uploads/1/3/0/2/130272981/sogidotidema-rujefa.pdf
    • http://saitamajalt.org/uploads/1/3/0/4/130435726/tukakitifada_salubawide_xexobal_zuruxekuz.pdf
    • http://secondaire1et2.net/uploads/1/3/0/8/130813913/nokukugulifada_tibeludupo_kifimed_sunelopijok.pdf
    • http://corvuspress.net/uploads/1/3/0/8/130873989/fuvipejekivewi.pdf
    • http://adriennelashemusic.com/uploads/1/3/0/5/130588779/7248455.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_off00005085.bin
d88e1c71c293265de50a178f3d1922636601eee36228d08765e690192e725ae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5085 6304 bytes

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