Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d786d626688043…

MALICIOUS

PDF

41.3 KB Created: 2020-03-23 05:56:53 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 064a01a3f14a396fbe16efbf8ed4319d SHA-1: cf3f8b44e5fcf1dea02b86b51d65673942ce2865 SHA-256: 61d786d6266880431340c82af16f9754686185c46bc811bef65c47c16c31057d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or SEO spam campaign. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the embedded URLs are the primary indicators of malicious activity, likely leading to further malicious content or phishing pages.

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://bmx-bundesliga.de/uploads/1/3/0/2/130272877/130272877.html#after+4+summary
    • http://jinshatiyuyulekaihu.f18.ebkf.org/uploads/1/3/0/2/130291922/tazuwewinodepupozab.pdf
    • http://theonegoods.com/uploads/1/3/0/7/130740210/8679055.pdf
    • http://paulrealtyinvestments.com/uploads/1/3/0/3/130324416/tifepuzurowiduj_nowinilezajido_tinunuzov_bedejatokonujer.pdf
    • http://killasports.com/uploads/1/3/0/5/130542728/boxefi.pdf
    • http://ibuyelectronic.com/uploads/1/3/0/5/130588343/difokexirabegovotu.pdf
    • http://chelseabaybooks.com/uploads/1/3/0/5/130540397/saritejali_badubozivodig_fokoxibuxaso.pdf
    • http://dwtsetx.com/uploads/1/3/0/6/130603922/d346e07cde9.pdf
    • http://riverscapealaska.com/uploads/1/3/0/8/130815008/xevap.pdf
    • http://cashincashoutrealty.com/uploads/1/3/0/5/130539449/1619768.pdf
    • http://110foxrunroad.com/uploads/1/3/0/8/130814310/segavawafowo.pdf
    • http://tools.mindhealthconnection.org/uploads/1/3/0/4/130436389/381c6869943.pdf
    • http://healthinsurancehelp.net/uploads/1/3/0/7/130776484/877552.pdf
    • http://hotel-tentrem.net/uploads/1/3/0/5/130589354/lirod.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_off00007b36.bin
a7dd5a3e0aa76f2aa1f1de7cb8ab808bd5d490a74419b271cc1fbbefcd96ca98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B36 7828 bytes

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