Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b91821f8fc4ede…

MALICIOUS

PDF

33.0 KB Created: 2020-05-23 06:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e509f33c459d3f2e4b37eb9e49c87d14 SHA-1: e2af8f7de51e14e60fa42e3fe6ccfffd8882a641 SHA-256: 43b91821f8fc4ede63ebcf2eac1908b76cd6927d4a80498885d678d7437b68fa
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains text that appears to be a lure, and the embedded URLs point to a large collection of PDF files hosted on various domains. This suggests a campaign to drive traffic to these external resources, likely for SEO manipulation or to distribute further malicious content.

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://distinctivejourneys.voyagerwebsites.com/uploads/1/3/0/8/130874544/130874544.html#entende+o+que+l%25C3%25AAs+ebook
    • http://librariesoutsidethebox.com/uploads/1/3/0/5/130539849/bf5af5c.pdf
    • http://ashleycs1.org/uploads/1/3/0/6/130639220/1247981.pdf
    • http://pureblissbodyandbeauty.com/uploads/1/3/0/2/130288317/gugogodipog-vigogifimariva-rabeve-sasaxukab.pdf
    • http://australianthermalimaging.com/uploads/1/3/1/4/131453965/8588613.pdf
    • http://carlislerrdpageant.com/uploads/1/3/0/7/130775747/pivoroxax-gatusitamogo.pdf
    • http://870realestate.com/uploads/1/3/1/3/131378915/4530726.pdf
    • http://pinkke.com/uploads/1/3/1/3/131398374/kebopapukabenesiton.pdf
    • http://bright-cloudsolutions.com/uploads/1/3/1/6/131637223/ba90f17f81a8.pdf
    • http://andreyblagotinsek.com/uploads/1/3/0/7/130740013/4307138.pdf
    • http://bigfactore.com/uploads/1/3/0/4/130435737/pafeseginup.pdf
    • http://camarederieltd.org/uploads/1/3/0/4/130488229/7515410.pdf
    • http://josefulgencio.com/uploads/1/3/0/8/130874127/mowozaxexemo.pdf
    • http://thinkagency.us/uploads/1/3/0/5/130551795/574314.pdf
    • http://madonmalin.com/uploads/1/3/0/6/130605374/zosetorexusasaliriku.pdf
    • http://motivemd.com/uploads/1/3/1/1/131164239/bizumes.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_off0000530b.bin
1739064fd2f05059bdd74c6903266a10b2f6282955f9b1007e5aec975fa18d90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x530B 11732 bytes

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