Malicious PDF — malware analysis report

Static analysis result for SHA-256 761d9603149ccbbd…

MALICIOUS

PDF

52.2 KB Created: 2020-05-07 08:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2bc5df1a6da81c92975a356b6c72ec15 SHA-1: ad4283a9f47e134669e3c1a3d8db41c0a3410460 SHA-256: 761d9603149ccbbd1f157c74514cd11528ccfd2eb7081408ce9182aacec6bc32
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file functions as a link farm, containing numerous external URLs that point to other PDF documents hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a tactic to artificially inflate search engine rankings or distribute malicious content through a large number of seemingly unrelated sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that this is not a legitimate document but rather a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://speelkoning.net/uploads/1/3/0/2/130272963/130272963.html#indicator+matrix+template
    • http://flipnfunmats.com/uploads/1/3/1/4/131438808/dakavizemelivuwoga.pdf
    • http://geekytrivia.com/uploads/1/3/0/3/130379305/5f9ab8d4bde.pdf
    • http://baseballsoftballelpaso.com/uploads/1/3/1/1/131163736/5167580.pdf
    • http://maxponticelli.com/uploads/1/3/0/4/130488251/ec83b95238.pdf
    • http://elizabeth-mcgarity.com/uploads/1/3/0/4/130478609/e8a37bcbd88c.pdf
    • http://gmuforensics.org/uploads/1/3/1/1/131164406/meberamufusig.pdf
    • http://holisticwellnessma.com/uploads/1/3/0/7/130740053/21e4fcbdbc0bb.pdf
    • http://ssscorpion.com/uploads/1/3/1/3/131384636/9be552.pdf
    • http://successcitymoney.com/uploads/1/3/0/4/130488701/bd28b5302e.pdf
    • http://aspirecycling.eu/uploads/1/3/0/4/130435701/6639129.pdf
    • http://deltagoldoffer.com/uploads/1/3/0/3/130323430/02fae95a.pdf
    • http://drainbaby.com/uploads/1/3/0/3/130313561/zopalu_lepuwemujokup_gagobukumubamam.pdf
    • http://onemanbandinc.org/uploads/1/3/0/4/130488834/tigukibaxewelazezeke.pdf
    • http://billmaus.com/uploads/1/3/0/6/130639750/223400.pdf
    • http://visionspecialistoflongwood.com/uploads/1/3/1/3/131384359/1914999.pdf
    • http://acodinginnovation.net/uploads/1/3/0/2/130287371/d01f706f.pdf
    • http://bransonceramics.com/uploads/1/3/0/3/130313783/ca9a919e9.pdf
    • http://rsasesores.es/uploads/1/3/0/5/130589056/zimax_telupubulaxawup.pdf
    • http://perspectivesbyjhw.com/uploads/1/3/0/2/130289515/8883845.pdf
    • http://bluedaisiedesigns.com/uploads/1/3/0/5/130540128/bd7f2a40c14.pdf
    • http://nashvilleperformancepsych.net/uploads/1/3/0/4/130436074/kokigoz.pdf
    • http://danielleharrislaw.com/uploads/1/3/0/7/130739525/6892462.pdf
    • http://sarahcrisscounseling.com/uploads/1/3/0/3/130323214/6931324.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off0000a204.bin
eec46b71e7d620e07cc6de01215eb1140cfd0fbb98db975e5510d99c91dc13f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA204 10492 bytes

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