Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c6588f80900324…

MALICIOUS

PDF

62.5 KB Created: 2020-03-24 09:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eb3913e8fe71f0c652ae0794ce7acc57 SHA-1: 8914438708fe73f91f4d37d0ddfb537bc9b06189 SHA-256: a6c6588f8090032417a5672c753cafcc706b23e949fbfedc6f3db2fc13183135
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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. The ML classifier also strongly indicated maliciousness. The embedded URLs point to various domains, all structured similarly, indicating a coordinated effort to distribute content or redirect users. No scripts were extracted from this sample.

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://mightypharaoh.com/uploads/1/3/0/7/130739711/130739711.html#use+the+word+except+in+a+sentence
    • http://vshardwoodfloorsllc.net/uploads/1/3/0/7/130739129/tigozos-kotiw-zunarotiwiwavi-siripaforopuleb.pdf
    • http://thelightroom.studio/uploads/1/3/0/4/130475959/tobadejazefeti.pdf
    • http://www.sharpimagehomes.com/uploads/1/3/0/2/130291552/0a2d5.pdf
    • http://panimals.com/uploads/1/3/0/7/130738723/dopilubewamow.pdf
    • http://frenchculinaryadventures.com/uploads/1/3/0/5/130545557/9730983.pdf
    • http://kittnplay.com/uploads/1/3/0/8/130873984/nuzulojopo_sebuda_takugufe.pdf
    • http://amazonfundllc.net/uploads/1/3/0/2/130273610/duzuwel.pdf
    • http://tincantob.com/uploads/1/3/0/6/130620989/sulefolijivib.pdf
    • http://freeachievers.com/uploads/1/3/0/8/130813904/woleka-lukuzupibitike.pdf
    • http://www.holisticveterinaryhousecalls.com/uploads/1/3/0/3/130313024/79ced.pdf
    • http://mx.thejar.org/uploads/1/3/0/7/130776676/5f959a9d25.pdf
    • http://www.readingtote.com/uploads/1/3/0/6/130603954/memon-rujap-rugiburizab.pdf
    • http://www.davenportishome.com/uploads/1/3/0/3/130313673/1840158.pdf
    • http://sd-solidarity.org/uploads/1/3/0/6/130621127/larivitur-fewuvefarab-bezulesaweti.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b722.bin
05bfd475856f1a6d0c2cc4bf626e49ed3fc0b9af39dabc28c549fe83c1aff177		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB722 7812 bytes
font_01_sfnt_off0000d5af.bin
8aa8646ccb736363f3087c90c16db2c208ceba3ef463bd505d6c2cd1febe6923		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 16080 bytes

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