Malicious PDF — malware analysis report

Static analysis result for SHA-256 778cdbf1786dd7bf…

MALICIOUS

PDF

56.7 KB Created: 2020-03-20 14:23:38 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2ae1c215e2f4508057c2888fde37534d SHA-1: d24f69f4db6d892f39d80994b284e33880aa5539 SHA-256: 778cdbf1786dd7bf65e0f59983dbcdcbd9f75f8f375fd4b97b2191c70746be93
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, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this finding. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to drive traffic to potentially harmful content.

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://dana-the-explorer.com/uploads/1/3/0/2/130289385/130289385.html#evenflo+litemax+dlx+infant+car+seat+reviews
    • http://ftnstudios.com/uploads/1/3/0/4/130488121/6829934.pdf
    • http://henrycollier.com/uploads/1/3/0/2/130272395/1328207.pdf
    • http://webdisk.regenexxservices.com/uploads/1/3/0/6/130605519/motebadi.pdf
    • http://site.continuingedhub.com/uploads/1/3/0/5/130543065/a660a274be2.pdf
    • http://gigietown.com/uploads/1/3/0/5/130539348/xifawidi.pdf
    • http://dorset-bike-ride.com/uploads/1/3/0/5/130589342/2548266.pdf
    • http://churchesindeerpark.org/uploads/1/3/0/5/130550783/gisof_minuki.pdf
    • http://mtopag.com/uploads/1/3/0/6/130604098/jifibaz.pdf
    • http://hostmaster.sodburyvalemusicals.co.uk/uploads/1/3/0/8/130813646/4767472.pdf
    • http://greengolfcertification.net/uploads/1/3/0/2/130272432/1929980.pdf
    • http://www.moderndayman.org/uploads/1/3/0/6/130604692/6648200.pdf
    • http://myownbank.co.uk/uploads/1/3/0/8/130874276/1134261.pdf
    • http://canadaquestexcursions.com/uploads/1/3/0/7/130739011/8f3fa0ec6.pdf
    • http://koolcompanies.com/uploads/1/3/0/6/130639699/1596113.pdf
    • http://10iramistakes.com/uploads/1/3/0/5/130589179/pogebifukaxepama.pdf
    • http://drterris.com.au/uploads/1/3/0/5/130539354/259053.pdf
    • http://twolittlepistols.com/uploads/1/3/0/5/130551059/9622484.pdf
    • http://instructeurstraining.com/uploads/1/3/0/4/130483294/5805701.pdf
    • http://www.mchavezhomepage.com/uploads/1/3/0/2/130272936/vipavakotir-kekikus-liraxesuxezufit.pdf
    • http://www.authenticbeing.net/uploads/1/3/0/9/130969905/75f70c30.pdf
    • http://studio15creations.shop/uploads/1/3/0/2/130272414/4068039.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a656.bin
4de15724516be1288d08b8942affdbafc78a8014bba99c6d99262e9024e6dbfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA656 8424 bytes
font_01_sfnt_off0000c6c4.bin
0089fd5ffcffe0292410c93bd69b3a109b2af9c38aa9a44eb17636f6307f89b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C4 2692 bytes

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