Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fdc78a9a1a08c64…

MALICIOUS

PDF

46.6 KB Created: 2020-03-30 07:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 299ad3b6af73c510e508bb5b17c080b4 SHA-1: becfbb4bc98a52320f492cee51942ba77ae7e8e8 SHA-256: 6fdc78a9a1a08c6433e7f79d1be84dcda934ec4c6c535427d3ffcd42c464c4db
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains references to these URLs, suggesting a deliberate attempt to redirect users to potentially malicious content hosted on these domains. The ML classifier also strongly indicated maliciousness.

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://adsl-63-204-18-60.benefitplans.org/uploads/1/3/0/5/130540118/130540118.html#disulfuro+de+carbono+formula+quimica
    • http://johnmappin.org/uploads/1/3/0/6/130639624/32af913b9ad147.pdf
    • http://healthymindedfamily.com/uploads/1/3/0/6/130620438/7422739.pdf
    • http://ks105.org/uploads/1/3/0/5/130588614/1002127.pdf
    • http://canberrajewishcommunity.org/uploads/1/3/0/6/130604079/wefufa.pdf
    • http://theconnectedlife.us/uploads/1/3/0/6/130604689/lojelewerozusa-lumijalejerura-vewirimewivas.pdf
    • http://darkecountyspecialolympics.com/uploads/1/3/0/5/130589278/xovalo.pdf
    • http://superiorcryptocool.com/uploads/1/3/0/5/130551524/lifutipuf.pdf
    • http://webdisk.ev-resource.com/uploads/1/3/0/7/130776847/61c4e64ae5.pdf
    • http://skintightbody.com/uploads/1/3/0/8/130874286/firuxos.pdf
    • http://carpetcleanersofgreenville.com/uploads/1/3/0/5/130588805/jidofivafabubi.pdf
    • http://topperstemeducation.com/uploads/1/3/0/4/130488669/56b9f63228dfca.pdf
    • http://gorbackphotography.com/uploads/1/3/0/7/130776081/wagared.pdf
    • http://mx.saint-tims.org/uploads/1/3/1/4/131407668/tugujo_bewawufobatuse.pdf
    • http://greaterfayettecountychamber.org/uploads/1/3/0/2/130289096/zabepubamomu-vaderupazif.pdf
    • http://do4dc.com/uploads/1/3/0/4/130436222/kufutuxer-timokejapak.pdf
    • http://stuccovenetiano.com/uploads/1/3/0/8/130814279/malexuj.pdf
    • http://markmorganministries.com/uploads/1/3/0/7/130774994/lativugadileruv-fomojugop-misoponusi-miraxaxokiwo.pdf
    • http://jessiebeefit.com/uploads/1/3/0/8/130874518/nonutozulovakus.pdf
    • http://turning65colorado.com/uploads/1/3/0/5/130589083/jagajosoz.pdf
    • http://emilytseng.com/uploads/1/3/0/9/130969963/mowako.pdf
    • http://vaporperformance.net/uploads/1/3/0/7/130775002/pekedenusado-tobelugimuxoseb.pdf
    • http://unmexciomasjusto.com/uploads/1/3/0/3/130313429/xebugapozevumosapa.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ea1.bin
d4b78c17e5694f9d629383f8845d72012b705f268c343f9968d707151c16caa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA1 9876 bytes
font_01_sfnt_off0000a113.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA113 2652 bytes

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