Malicious PDF — malware analysis report

Static analysis result for SHA-256 44769395542de38b…

MALICIOUS

PDF

81.4 KB Created: 2020-03-08 11:26:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-10
MD5: 3e95d700f173ff29af92e046a1511b93 SHA-1: 18506c220941d2a919b023ed2046e08a86b77eb2 SHA-256: 44769395542de38b92b1b2b86c76c78f3eaf141d6cdd4cbb67229ea3af372c8c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The document body, though heavily obfuscated, contains text referencing 'A doll's house by Ibsen sparknotes' and the wkhtmltopdf application, suggesting a lure to a fake academic resource. The primary heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with 'jakebrenneise.net' being a dominant host, pointing towards a link farm strategy. No scripts were extracted from this sample.

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://lorishreiner.com/uploads/1/3/0/8/130814749/130814749.html#a+doll%27s+house+by+ibsen+sparknotes PDF link annotation
    • http://jakebrenneise.net/uploads/1/3/0/6/130620691/8f92a629.pdfIn PDF document text
    • http://myhtri.net/uploads/1/3/0/3/130379232/832342.pdfIn PDF document text
    • http://ladycakeboss.net/uploads/1/3/0/4/130435972/0f0d3b11116.pdfIn PDF document text
    • http://collabsys.com/uploads/1/3/0/6/130604417/86f0acc3a225402.pdfIn PDF document text
    • http://mail.elfcoaching.com/uploads/1/3/0/7/130776888/reromasinuw.pdfIn PDF document text
    • http://theraidergroup.net/uploads/1/3/0/2/130272415/9e9cb719f59.pdfIn PDF document text
    • http://alonsoquintanilla.com/uploads/1/3/0/5/130589186/3060cac7.pdfIn PDF document text
    • http://racksrus.net/uploads/1/3/0/6/130604169/vezumotupa_raler_xobavunusi_kazogusimid.pdfIn PDF document text
    • http://karmatechnic.com/uploads/1/3/0/7/130739470/ganofiji-jizopuleli-foxepigo-losasororev.pdfIn PDF document text
    • http://backtozero.org/uploads/1/3/0/7/130738751/wiwetaf.pdfIn PDF document text
    • http://quotes180.com/uploads/1/3/0/9/130969062/9d9b9964d97b.pdfIn PDF document text
    • http://youbangtaobaowangwangqunfaruanjian.thesurge.cc/uploads/1/3/0/6/130605018/ee38c.pdfIn PDF document text
    • http://chocolatecsa.com/uploads/1/3/0/4/130436125/mujuvimukiwe.pdfIn PDF document text
    • http://petershenkinlaw.com/uploads/1/3/0/3/130323271/gipesumaxi_rawago_texusoperem.pdfIn PDF document text
    • http://napawinemagazine.com/uploads/1/3/0/5/130551576/vazodudefoxepetirig.pdfIn PDF document text
    • http://cours-de-batterie-fouesnant.com/uploads/1/3/0/4/130491513/8542789.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 9684 bytes
SHA-256: 10f806601dd60cf7467f8310a3ffc1afcd031ec7f184df7aefb6d1290eca7850
font_01_sfnt_off0001129c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129C 9692 bytes
SHA-256: 8ea69ca5fdf8a0facf6326bb9107a3766667cd08ebd0cd1af40155782c5096c4

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