Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c32cccc1130b1c…

MALICIOUS

PDF

29.3 KB Created: 2020-04-02 06:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d4da4e644689d2b922b57dccdf67b767 SHA-1: 7286db657bc9285e6dcabfb90369d3a620ae3a64 SHA-256: 79c32cccc1130b1cecac8e1f46611126a6ba703cb14a84b35dc2efd6d6342928
96 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary purpose appears to be directing users to a multitude of unrelated websites, likely for SEO spam or to host further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs supports this assessment.

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://mhrandlenovels.com/uploads/1/3/0/6/130604556/130604556.html#placa+madre+asus+a320m-k+am4
    • http://missdayteaches.com/uploads/1/3/0/9/130969076/2004224.pdf
    • http://districtmatl.com/uploads/1/3/0/2/130289571/1107163.pdf
    • http://augrio.ai/uploads/1/3/0/5/130551033/padomoleninix-zuvobi-zupuwigi-bikerumavoxut.pdf
    • http://sleekhairandbeyond.com/uploads/1/3/0/7/130740077/3452021.pdf
    • http://faststartnutrition.com/uploads/1/3/0/6/130605397/wojonebexisu.pdf
    • http://essentiallywellrva.com/uploads/1/3/0/8/130874541/dapizex_zujefusira.pdf
    • http://heidihackford.net/uploads/1/3/0/4/130489742/5d0388cb175ca35.pdf
    • http://lakenormandruglawyer.com/uploads/1/3/0/7/130739944/3173b.pdf
    • http://good2goveggie.net/uploads/1/3/0/7/130739158/0eda2a298eb03aa.pdf
    • http://bitsandbobs.shop/uploads/1/3/0/8/130873930/tipidazojuji_pepalazufukim_mikezu.pdf
    • http://transformingnextgen.net/uploads/1/3/0/6/130639254/jigefiwetobev_pezukuseve_dedumaxofim.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_off00004e48.bin
8b997aef77e47c83d4768d7fc9c7fce07f7e1a5a838bdf675399275c35abe7c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E48 6628 bytes

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