Malicious PDF — malware analysis report

Static analysis result for SHA-256 50762868c434a190…

MALICIOUS

PDF

41.8 KB Created: 2020-03-27 13:16:12 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3932959a3ffee65b6f86e71fbf93bdec SHA-1: 256b16f5c70dd30165c774dd8db51d58046d65ef SHA-256: 50762868c434a190fe089bc59bb7983ce776d46ae9d05760f4598a4dfe016ea2
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content hosted on numerous domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious link structure. The document body contains garbled text and some URLs, reinforcing the link farm observation.

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://bartolomeilaw.com/uploads/1/3/1/4/131412290/131412290.html#polk+audio+rm6750+review+cnet
    • http://behaviorman.org/uploads/1/3/0/5/130545565/2679309.pdf
    • http://blackpreacherinawhitetown.com/uploads/1/3/0/6/130621847/73cb1b0b93bf53.pdf
    • http://administrator.iqengineeringconsultants.com/uploads/1/3/0/6/130620758/233812192b.pdf
    • http://daizydo.com/uploads/1/3/0/9/130969218/8c117c5f.pdf
    • http://impactproductionsgroup.com/uploads/1/3/0/3/130379252/9986332.pdf
    • http://eternalspringtime.com/uploads/1/3/0/5/130550938/db13246afa.pdf
    • http://www.jcountyacademy.org/uploads/1/3/0/6/130639766/5ee9f5.pdf
    • http://mrcampbellsmathclass.com/uploads/1/3/0/7/130776101/ba430f7ca41.pdf
    • http://northstarmedics.com/uploads/1/3/0/6/130620881/sijovakufa-pukibuda.pdf
    • http://www.fersesspecialtystore.com/uploads/1/3/0/5/130551363/doteperakuvite.pdf
    • http://svetsfiltar.com/uploads/1/3/0/5/130588763/kabebaxowovirij-rilitatovupaga-tajutomefuv.pdf
    • http://altorunning.com/uploads/1/3/0/6/130639721/12d9857f9fa30f.pdf
    • http://www.pmnecc.org/uploads/1/3/0/2/130272388/lowateselufev.pdf
    • http://ezwash.biz/uploads/1/3/0/6/130605108/85b93dc92eb3e.pdf
    • http://lowelldavies.com/uploads/1/3/0/7/130775495/sefatogafiberu_femiw.pdf
    • http://knminidiggers.com/uploads/1/3/0/8/130873712/magozurisikobivaru.pdf
    • http://gregsgear.com/uploads/1/3/0/6/130639034/nosilelup-xosirexas-sixofutineku.pdf
    • http://sakyaponloptashirinpoche.com/uploads/1/3/1/0/131071175/werovam_zanepufofewi_sizuzanizanal.pdf
    • http://www.ozworsolutionsbullion.com/uploads/1/3/0/6/130639934/801106.pdf
    • http://www.kitsaphomes.com/uploads/1/3/0/4/130476045/manefibezup_sapuvu_viwebebex_sutum.pdf
    • http://connecteducation.net/uploads/1/3/0/7/130739328/rotubafo.pdf
    • http://roombyroom.co.nz/uploads/1/3/0/7/130776755/paranibuvewatemumova.pdf
    • http://exhaleyogaoroville.com/uploads/1/3/0/7/130776319/7304180.pdf
    • http://micapreneurship.com/uploads/1/3/0/6/130639155/pisafedidipebos.pdf
    • http://www.devotionswithdennis.com/uploads/1/3/0/8/130873790/1447e2639.pdf
    • http://exhaleyogaoroville.com/uploads/1/3/0/7
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079d1.bin
289a2b707ec3084da04c97515c72bdb8f3c529c6f29700cf167d37d283729ea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D1 7768 bytes

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