Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a475aa3542d35c…

MALICIOUS

PDF

48.5 KB Created: 2020-03-21 01:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e6f87b820c3965e5468da40d47a9006e SHA-1: dc28b4325473ee9f42b306b32c1610287040f8e6 SHA-256: c4a475aa3542d35cdf5d44c92c231b7a82b576892005731c46d5d48adc6cdbca
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 to other PDF files hosted on various domains. This pattern is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this sample as malicious, supporting the suspicious nature of the extensive link farm.

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://teresahogan.org/uploads/1/3/0/5/130540359/130540359.html#como+se+dice+todo+bien+en+portugues
    • http://atolyedokuzsekiz.com/uploads/1/3/0/7/130739175/safulimiwixejeme.pdf
    • http://merritt4nm.com/uploads/1/3/0/5/130550736/savatusisusegininu.pdf
    • http://10iramistakes.com/uploads/1/3/0/4/130435536/kafamuzisapal.pdf
    • http://lena-lennrot-fitness.com/uploads/1/3/0/3/130379222/vulusurinezazatuni.pdf
    • http://mommyfittemecula.com/uploads/1/3/0/6/130639348/guzunuteb.pdf
    • http://glastometmarine.com/uploads/1/3/0/6/130621226/tofex.pdf
    • http://coffeeupsidedown.com/uploads/1/3/0/5/130543979/6742621.pdf
    • http://mca718.com/uploads/1/3/0/7/130775808/5713368.pdf
    • http://graphiteredmedia.com/uploads/1/3/0/7/130776823/9139249.pdf
    • http://www.paroissechalonscentre.com/uploads/1/3/0/5/130539170/7f2094cf6.pdf
    • http://prettygoodfab.com/uploads/1/3/0/2/130271150/belokefare.pdf
    • http://fromflab2fit.com/uploads/1/3/0/5/130539109/ab7780018da0.pdf
    • http://subscribe.iepguru.com/uploads/1/3/0/6/130639592/4876960.pdf
    • http://project-27.net/uploads/1/3/0/7/130738741/1094315.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_off00009272.bin
9b6bb4439aaf3627165bcec878ac8b25ed4fafe9460f6997a81b4114fda63b5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9272 9896 bytes

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