Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c2f695c915001c…

MALICIOUS

PDF

36.6 KB Created: 2020-05-31 18:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10df3f21774b20243e9edb9e7af2da22 SHA-1: 354c2835e2636971437d0951a370a8eb7cc4d2d7 SHA-256: 76c2f695c915001c4530e0523ab70ce38edd29d072b9828034075e756dadd809
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF document exhibits characteristics of a link farm or SEO spam, containing numerous external links to other PDF files hosted across various domains. The ML classifier strongly indicated maliciousness, and the presence of a large number of external links suggests an attempt to manipulate search engine results or distribute additional malicious content. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://eyesexpressbensalem.info/uploads/1/3/0/5/130539697/130539697.html#harvard+air+hockey+table+parts
    • http://7cstravel.voyagerwebsites.com/uploads/1/3/0/4/130478261/6404570.pdf
    • http://cremerinc.com/uploads/1/3/0/5/130588799/ridorixiladexaz.pdf
    • http://beachhousemarketgarden.com/uploads/1/3/0/2/130289317/likadobivebopalerupa.pdf
    • http://bayareaboatandhomeloans.com/uploads/1/3/1/3/131383821/8134587.pdf
    • http://encorporation.org/uploads/1/3/0/6/130604305/jibutexesurefekel.pdf
    • http://vidalytics.net/uploads/1/3/0/3/130313026/rabelunafopoxuj.pdf
    • http://minibeastmayhem.com/uploads/1/3/0/4/130488410/2113279.pdf
    • http://oakdellfarm.com/uploads/1/3/1/3/131380420/1b27d3.pdf
    • http://mrsadamsrm139.com/uploads/1/3/0/7/130775292/xowupelod_kigosajugelemo_xodasuvuwetab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bamisenu.files.wordpress.com/2020/05/resegi.pdf
    • https://dameniv.files.wordpress.com/2020/05/49295786145.pdf
    • https://gupadolajiwu.files.wordpress.com/2020/05/nejizetozutarowevogo.pdf
    • https://vijugogazoxo.files.wordpress.com/2020/05/51409091685.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006488.bin
dedceff346cf8f32e2a95c44b3ecdc717b85d46f978d1fdb2c6c8dafcab08cbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6488 10352 bytes

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