Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92489ee4fa0ad02…

MALICIOUS

PDF

36.7 KB Created: 2020-03-22 01:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 152f9e2568344801a94d44b5b65dd30d SHA-1: 8dd5638d1d8d4bfa70e88a38c32ced776d24cec9 SHA-256: d92489ee4fa0ad028d7f4ac3bbc672b8eb5f20ef71825ad24b5f855e1c512702
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO spam or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a vast network of linked PDF files hosted on numerous domains, likely to obscure the ultimate malicious destination or to engage in link farming.

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://christinabeautyparlour.com/uploads/1/3/0/9/130969496/130969496.html#do+you+put+a+comma+before+and+after+too
    • http://augustinelab.org/uploads/1/3/0/6/130639212/1662a3efbe136.pdf
    • http://rustb-b.com/uploads/1/3/0/7/130738632/b1b438a4d3a1c97.pdf
    • http://conectamarketing.org/uploads/1/3/0/5/130551162/22cb7bf8c46.pdf
    • http://lydia-bartlett.com/uploads/1/3/0/5/130588966/5c8092ef1f73bea.pdf
    • http://thedaywithflower.com/uploads/1/3/0/5/130590111/fanezo-loruxetofomuwof-fodirowu.pdf
    • http://argfineng.com/uploads/1/3/0/5/130546153/gosagodo.pdf
    • http://dbarndoor.com/uploads/1/3/0/7/130738972/duzanu-kubunuwisixetar.pdf
    • http://billzammmitmindcoach.com/uploads/1/3/0/8/130814311/5799221.pdf
    • http://9itgw.bpmtc.com/uploads/1/3/0/4/130477085/fegajuzasud_rafowobidaf_rewuv.pdf
    • http://ogdencleaners.org/uploads/1/3/0/2/130287920/sudarafatoxe.pdf
    • http://mossvalewellbeing.com/uploads/1/3/0/5/130588437/714777.pdf
    • http://burningfiddleproductions.org/uploads/1/3/0/5/130539756/dc76d8e51974c.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_off00006592.bin
16c3a1e05a8771730d4632ba9eb0dc32a19932bade5e34113264f13e6a1e5fd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6592 7868 bytes

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