Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9d8c9b9beab846…

MALICIOUS

PDF

40.2 KB Created: 2020-05-17 13:39:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bb6ffae5ebd7f53f61182809c186223 SHA-1: 587265cdded80f3e3a4e67e688be4861d1ec8983 SHA-256: 6f9d8c9b9beab8462dcb11b7a60130e6a1d65e0659e5c8a5a1a996a8408248d6
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 malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the embedded URLs are the primary indicators of compromise.

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://thenannysden.com/uploads/1/3/0/2/130287257/130287257.html#2018+calendar+pdf+august
    • http://aidbprestige.com/uploads/1/3/0/7/130738846/lagolunugore-dirijebipiworu.pdf
    • http://almightygardenz.com/uploads/1/3/0/6/130640179/a297eaed507df.pdf
    • http://decoratingmaine.com/uploads/1/3/1/6/131606208/4516aac3.pdf
    • http://myanmarlifechannel.com/uploads/1/3/0/2/130288321/945990.pdf
    • http://nasumo.com/uploads/1/3/0/4/130436431/e347dee0068d194.pdf
    • http://luckyslothinteractive.com/uploads/1/3/0/4/130435787/9191275.pdf
    • http://tessavon.com/uploads/1/3/0/5/130588575/xejonaxodofok-dixepidepogeva-madulufivob.pdf
    • http://andrewlaskowski.net/uploads/1/3/0/4/130489371/1cf24d.pdf
    • http://abarrotescova.com/uploads/1/3/1/3/131379496/witonadetamekor-ledomowanenaxub.pdf
    • http://elongafood.net/uploads/1/3/0/9/130969746/6888864.pdf
    • http://exoticracingshocks.com/uploads/1/3/1/4/131406263/0eb3ff0f71.pdf
    • http://craftsbytheriver.com/uploads/1/3/0/3/130379522/1036744.pdf
    • http://inknolascreenprinting.com/uploads/1/3/1/3/131379379/regesutuxugobe-zejid-vukesuk-zevodewoji.pdf
    • http://jpierre.shop/uploads/1/3/1/4/131483209/ed11e5bdc4ad6.pdf
    • http://the-hotel-academy.com/uploads/1/3/0/9/130969353/gifelakubimagos_biwidutono_resibupixebani_gobeladifizi.pdf
    • http://northwalesvwt5.club/uploads/1/3/1/3/131383580/9334876.pdf
    • http://wedlockphoto.com/uploads/1/3/0/5/130540554/nimika.pdf
    • http://757realestatecareers.com/uploads/1/3/0/5/130589007/1565984.pdf
    • http://troylittleitaly.org/uploads/1/3/0/4/130483990/lexawutodeba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b88.bin
397f8d260e7fd63cd92fe648ed5d8162b85089264780938e97b458ada126e478		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B88 10216 bytes
font_01_sfnt_off00007ed1.bin
32f4f1f0b695e5d4615fbcad4b5b3a29e2120f680b26ad6392bb678d83ba1141		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED1 16108 bytes

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