Malicious PDF — malware analysis report

Static analysis result for SHA-256 616d55a8ca178c4f…

MALICIOUS

PDF

42.0 KB Created: 2020-06-04 21:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4a960231272fa3f8f9548cf4d3d357a SHA-1: ee4b5efd9b8571f2be040096c5336812fb08d51d SHA-256: 616d55a8ca178c4f4f2447c8710f0136a8d6691be15d9f5b0fe975619bf58322
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document impersonates a cloud document service to lure the user into clicking on embedded links, such as the one for a "pdf xchange editor pro serial key". The document contains a large number of external links, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://3kingscustomhomes.com/uploads/1/3/0/6/130639147/130639147.html#pdf+xchange+editor+pro+serial+key
    • http://equestrian-home-inspiration.com/uploads/1/3/0/2/130272344/4196869.pdf
    • http://extps.org/uploads/1/3/1/4/131437350/c4b7e4deb9c66.pdf
    • http://truehealthcompany.com/uploads/1/3/0/6/130604694/begaw.pdf
    • http://untildeathdouspart.be/uploads/1/3/0/5/130544872/falome-mokixisixutu-liwapexiv-rowej.pdf
    • http://webdisk.poodlesoftampabay.com/uploads/1/3/0/6/130604765/1c5012.pdf
    • http://thepublicknows.com/uploads/1/3/1/3/131381376/5d99e3bd48.pdf
    • http://bigboldbeautifuljourney.com/uploads/1/3/0/4/130477541/sunipi-fanivesom.pdf
    • http://harkerhardwoods.com/uploads/1/3/0/8/130874424/f8b051.pdf
    • http://simplicityinliving.com/uploads/1/3/0/5/130550970/1568958.pdf
    • http://3kingscustomhomes.com/uploads/1/3/0/6/130639147/terms.html
    • http://3kingscustomhomes.com/uploads/1/3/0/6/130639147/dmca.html
    • http://3kingscustomhomes.com/uploads/1/3/0/6/130639147/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://pijetodewi.files.wordpress.com/2020/06/72382898709.pdf
    • https://robesezidir.files.wordpress.com/2020/06/80431329547.pdf
    • https://paxaweki176183565.files.wordpress.com/2020/06/jaxixopomebod.pdf
    • https://letajesuki.files.wordpress.com/2020/06/69252345252.pdf
    • https://jenurozogu.files.wordpress.com/2020/06/84239063715.pdf
    • https://pitosabutage.files.wordpress.com/2020/06/fikubipifalejariginemam.pdf
    • https://sivemaga.files.wordpress.com/2020/06/losojaxugik.pdf
    • https://bujamabak.files.wordpress.com/2020/06/juvav.pdf
    • https://jeronakuweni.files.wordpress.com/2020/06/dixuvokegagekamomuruxu.pdf
    • https://rurinume.files.wordpress.com/2020/06/talogizoxagikeminaxazud.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000763f.bin
fc68ff74803f3c609ef114954befeb390f1930c870cbb6873d8b2c6960518423		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763F 11052 bytes

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