Malicious PDF — malware analysis report

Static analysis result for SHA-256 8046fc86c8801901…

MALICIOUS

PDF

41.2 KB Created: 2020-04-01 18:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 22917ac3367983d0c740c6ad8139e9ab SHA-1: 08866629476a8ccef85388a1951058ad4c84cafe SHA-256: 8046fc86c8801901462e65bdc9a7b9cd344c5aa53e1439a70ef3847dc7e7c149
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted, but the primary attack pattern involves directing users to a multitude of potentially compromised or malicious websites.

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://theartoftea.org/uploads/1/3/0/7/130740232/130740232.html#icd+10+code+for+heavy+uterine+bleeding
    • http://foundationrepairinhoustontexas.com/uploads/1/3/0/4/130494871/rikobino.pdf
    • http://www.honourdignitycoalition.org/uploads/1/3/0/2/130288514/foraf.pdf
    • http://inthesmallthings.com/uploads/1/3/0/6/130604703/14c16c.pdf
    • http://strongtowerfellowship.net/uploads/1/3/0/6/130621870/boleroweguwufubil.pdf
    • http://fireantradio.com/uploads/1/3/0/6/130620990/e7b4b375ab9958c.pdf
    • http://royalsingalongparties.com/uploads/1/3/1/3/131380767/64246e5c0.pdf
    • http://byoucreative.com/uploads/1/3/0/8/130874513/9767909.pdf
    • http://dandbrentalsllc.com/uploads/1/3/0/4/130436282/594404.pdf
    • http://johnsonburgasd.net/uploads/1/3/0/5/130543074/3150b2016b.pdf
    • http://mta-sts.mail.claylinen.com/uploads/1/3/0/6/130604728/tijolu.pdf
    • http://addoelephantparksafari.com/uploads/1/3/0/5/130550744/bubamagorofimum.pdf
    • http://thebreakroomcenter.net/uploads/1/3/0/6/130604690/0e089bc.pdf
    • http://nonstopinterior.com/uploads/1/3/1/4/131406681/1974642.pdf
    • http://buildingsinink.com/uploads/1/3/0/2/130271137/6119817.pdf
    • http://webmail.kuduroofing.com/uploads/1/3/1/4/131453894/3557117.pdf
    • http://timfoleydevelopment.com/uploads/1/3/0/5/130588913/xarasisizemi-xazizumi.pdf
    • http://geoffpridham.com/uploads/1/3/0/6/130604524/bavofex.pdf
    • http://alpacamacs.com/uploads/1/3/0/6/130620375/xojoxutexo.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077cb.bin
0f4d8bbd22deb800ea3ceaa2c37133054efc45269a25e98f72d519454d77b500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CB 8120 bytes

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