Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d32798cc6b85380…

MALICIOUS

PDF

42.9 KB Created: 2020-03-29 15:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2b5a162693aa3849d430238519a82ba5 SHA-1: 2a6fff3260d01bdc25fe33c5626d6ea117f95301 SHA-256: 2d32798cc6b85380f42f6b31969084579c1a96a6a48507ec6d9bd2c689baa5f9
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique commonly used for SEO poisoning or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, and the document body contained mostly metadata and garbled text, but the presence of a link farm is sufficient evidence of malicious intent.

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://neokundalini.org/uploads/1/3/0/7/130739711/130739711.html#blue+wheaten+ameraucana+cockerel
    • http://twins4thewin.com/uploads/1/3/0/6/130604728/dumanukekunodirolina.pdf
    • http://sealandsons.com/uploads/1/3/1/1/131164205/497f3e269f55d.pdf
    • http://expand-my-brand.com/uploads/1/3/0/6/130620758/xilusitusafaduxizezo.pdf
    • http://xactaclaimz.com/uploads/1/3/0/3/130323222/1742948.pdf
    • http://nashsaves.org/uploads/1/3/0/2/130287938/7950545.pdf
    • http://mail.franklinvetclinic.com/uploads/1/3/0/5/130590432/xojelazuwugoporub.pdf
    • http://ray7coughlin.com/uploads/1/3/0/9/130969847/75084c24a8.pdf
    • http://armswideopenadoption.com/uploads/1/3/0/8/130874120/dfeef01d4bf.pdf
    • http://smarter-social.com/uploads/1/3/0/2/130270945/nuzunatufaxulowemiz.pdf
    • http://nerdsnapmedia.net/uploads/1/3/0/2/130273980/wazujaba.pdf
    • http://gocleanerwater.com/uploads/1/3/0/6/130604427/godosajo-gagemu-garuguzisin-wemefizamuk.pdf
    • http://webdesign-templates.nl/uploads/1/3/0/5/130543874/7a33f2c62176499.pdf
    • http://cindycontrerasmua.com/uploads/1/3/0/2/130288329/034f4f9b7f.pdf
    • http://mimicveganmeats.com/uploads/1/3/0/6/130603913/9930135.pdf
    • http://barrons100.com/uploads/1/3/0/5/130544437/rumobexipip.pdf
    • http://rouletteinvestor.com/uploads/1/3/0/3/130323159/pafogabakomepusedenu.pdf
    • http://rjmanutencaodeveiculos.com/uploads/1/3/0/5/130588861/04baf4f67c.pdf
    • http://creekside.site/uploads/1/3/0/6/130639888/4571641.pdf
    • http://snowdonia-estateforsale.com/uploads/1/3/0/3/130312926/wozenujo-viraginofaleko-femuvuxevet.pdf
    • http://r3healthandfitness.com/uploads/1/3/0/8/130874396/3673664.pdf
    • http://sodajerksodaco.com/uploads/1/3/0/7/130775760/810052.pdf
    • http://mypolishlife.com/uploads/1/3/1/0/131070526/d72b3d76a2.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_off000080df.bin
d60bfa449be8ae5a69066019dea63e284e7b0c1efe1da91e64b089be94085cf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80DF 7388 bytes

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