Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9966e662a5deff…

MALICIOUS

PDF

56.7 KB Created: 2020-05-21 05:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a66e387a277f96068d5b36620922889f SHA-1: b96f1c558f1462f7c0aaadcebbc4c5ac43b7bc76 SHA-256: 5c9966e662a5deff258aa57ddaab394bb730eb22b7a31cee269c06fb5583ad5c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest a link farm or SEO spam tactic, potentially leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://topcoatdesign.net/uploads/1/3/0/6/130621648/130621648.html#atharva+veda+hindi
    • http://towglendaleaz.com/uploads/1/3/0/3/130379596/vurawubetalutob-zinuku.pdf
    • http://cherryblossompowdercoating.com/uploads/1/3/0/7/130739786/6592585.pdf
    • http://fordsbushbiblechurch.com/uploads/1/3/0/6/130603892/e8d1bf12537ab2a.pdf
    • http://heavensearthlyriches.info/uploads/1/3/1/3/131379268/0e6cc.pdf
    • http://lindaknappett.com/uploads/1/3/1/4/131454883/9399574.pdf
    • http://myseniordocuments.com/uploads/1/3/0/6/130604487/kamekefisi-gunideta.pdf
    • http://honeycreatiions.com/uploads/1/3/0/4/130476885/367310.pdf
    • http://arefehhashemi.com/uploads/1/3/1/3/131380470/rizuxudas.pdf
    • http://sloanemitchell.com/uploads/1/3/0/6/130639701/pugusabejefal.pdf
    • http://jllnwdatacenters.com/uploads/1/3/0/6/130639285/3342930.pdf
    • http://huisalumni.com/uploads/1/3/1/4/131437956/geketazema-kolarunuzinunen.pdf
    • http://allenssnowremoval.com/uploads/1/3/0/8/130814534/8642359.pdf
    • http://fwd-momentum.net/uploads/1/3/0/6/130639222/7216177.pdf
    • http://geointerio.com/uploads/1/3/1/4/131453934/koguz_rumeko.pdf
    • http://wanderingcoach.com/uploads/1/3/0/2/130272804/nujowej-levurebogizanez-popivile-finebikikuza.pdf
    • http://gjmultiskill.org/uploads/1/3/0/8/130874286/vademuxepepe-joxavas.pdf
    • http://weariwin.com/uploads/1/3/0/7/130775441/3282349.pdf
    • http://stacicroomraley.com/uploads/1/3/1/3/131398219/kodewok.pdf
    • http://afcyberworx.info/uploads/1/3/0/2/130287866/laluwezepoxiz.pdf
    • http://redwood.tools/uploads/1/3/0/9/130969130/nonede_tuxadoninuf.pdf
    • http://unitedpermianbasin.net/uploads/1/3/0/6/130603895/d777c0a6f9f4.pdf
    • http://ctech-solutions.com/uploads/1/3/0/7/130775768/90e02280f.pdf
    • http://multilevelframing.com/uploads/1/3/0/7/130739101/xujut.pdf
    • http://charmers.no/uploads/1/3/1/3/131379874/6eb5247.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • 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://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e65.bin
40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E65 3720 bytes
font_01_sfnt_off000089c7.bin
c67d0d2e7777e38f62b601b0208512565b827f3e71b6d8142c3868232619a5d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89C7 10076 bytes
font_02_sfnt_off0000acb7.bin
691a293f9a09cf273323e8e5786be5e9527a4ff756125cb91fd8ed7e54434bc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACB7 13988 bytes

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