Malicious PDF — malware analysis report

Static analysis result for SHA-256 05dd54d888c1bdf7…

MALICIOUS

PDF

41.9 KB Created: 2020-03-11 08:10:19 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2dae7da4e4a77ba2da9b463a9882da95 SHA-1: 2ae3edd38f64b533e9e439d138884c9592830356 SHA-256: 05dd54d888c1bdf726df2ac47ff425e0dd3b39a069eddb1f4d2fe700e86622bd
136 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are algorithmically generated and point to other PDF files. This behavior is indicative of a link farm or a distribution mechanism for malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the extensive use of external URLs suggests a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://magnoliastravelandtouradventures.voyagerwebsites.com/uploads/1/3/0/2/130292007/130292007.html#how+to+write+a+cover+letter+for+an+internship+uk
    • http://harrietarkley.com/uploads/1/3/0/8/130813732/vejepagesusaludejugu.pdf
    • http://www.cobratiger.com/uploads/1/3/0/3/130379105/toviwiferinal_fazorited_nagofuxaz_nanidawakuwage.pdf
    • http://cpanel.mutebuzz.com/uploads/1/3/0/4/130488241/6465475.pdf
    • http://prudentialdefense.com/uploads/1/3/0/8/130813956/jidim.pdf
    • http://incredithaw.com/uploads/1/3/0/5/130539497/wufagotemo_sezedegejoguzi_geluwukoget_zedalikarepu.pdf
    • http://porvoo2020.com/uploads/1/3/0/5/130588457/fikanuwajuxe_dozadokofo.pdf
    • http://dieseldocdenver.com/uploads/1/3/0/6/130603825/4299778.pdf
    • http://nastockdogassociation.com/uploads/1/3/0/4/130489226/9357046.pdf
    • http://www.rollingstoenphotography.com/uploads/1/3/0/5/130550697/virelem_jefin_fokasaxi_votaniluvu.pdf
    • http://www.buy-arts.net/uploads/1/3/0/7/130740625/sukajogok.pdf
    • http://bravocharlie.pl/uploads/1/3/0/4/130475923/kupedopigem.pdf
    • http://mrsroe.com/uploads/1/3/0/4/130476657/jomirutov.pdf
    • http://www.carolinayphilip.com/uploads/1/3/0/7/130776148/9bb3e5a80.pdf
    • http://backhomeadu.org/uploads/1/3/0/8/130814774/1339798.pdf
    • http://www.aucklandhousesitting.com/uploads/1/3/0/4/130435596/9549450.pdf
    • http://nw4.me/uploads/1/3/0/6/130639629/vuduwuburino.pdf
    • http://hipsterpelicancomics.com/uploads/1/3/0/7/130776276/6919374.pdf
    • http://www.ionosphere.org.uk/uploads/1/3/0/7/130775275/8fdaa6.pdf
    • http://radioclarendon.org/uploads/1/3/0/5/130589000/af9ca06b0f9b2.pdf
    • http://mx.cerveceriaartesanalsanpancho.com/uploads/1/3/0/8/130874276/f08c1ba.pdf
    • http://hostmaster.citrap.ch/uploads/1/3/0/6/130639034/vuvejelisozukiwakabi.pdf
    • http://sfs-services.com/uploads/1/3/0/9/130969154/1404075.pdf
    • http://tedxyouthisf.com/uploads/1/3/0/8/130814992/00b0e2.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_off0000781b.bin
db0c7e71edb556b43aac47b245b23e9a8718da646f256979f2dc25061ab065f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x781B 8292 bytes

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