Malicious PDF — malware analysis report

Static analysis result for SHA-256 607c50a87e8d7174…

MALICIOUS

PDF

49.2 KB Created: 2020-03-24 23:54:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e7f2fd21c431f296237e502819c4d158 SHA-1: 29814b2c22817075239618d62d97b0c97f9a5567 SHA-256: 607c50a87e8d7174f5d43fe6a6f470e49c882986e9ee2c761028f9616344e65d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were directly extracted, the nature of the embedded links suggests a potential for further malicious activity, such as downloading second-stage payloads or phishing.

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://provisiontransportationma.net/uploads/1/3/0/7/130775870/130775870.html#meaning+of+islamic+name+zaina
    • http://hostmaster.ukcamperhire.uk/uploads/1/3/0/6/130604153/jesitonemelevu.pdf
    • http://jjblackcarservice.net/uploads/1/3/0/4/130436141/firazawu.pdf
    • http://crazysheltie.com/uploads/1/3/0/2/130291779/90839f40b6a0.pdf
    • http://diginkmedia.com/uploads/1/3/0/6/130639739/180.pdf
    • http://mommytakethewheel.com/uploads/1/3/0/2/130272557/71cfff4.pdf
    • http://mail.cindynewcomer.com/uploads/1/3/0/8/130874514/2957462.pdf
    • http://jakdempseydesign.co.uk/uploads/1/3/0/5/130590029/zujebos.pdf
    • http://webdisk.equuso.com/uploads/1/3/0/7/130739454/wegupal_kutanal.pdf
    • http://mta-sts.mx.imagesbyk.com/uploads/1/3/0/5/130589222/7ad971b.pdf
    • http://mattkessler210.com/uploads/1/3/0/4/130483805/2748677.pdf
    • http://johnsoninteriors.shop/uploads/1/3/0/6/130603853/8574005.pdf
    • http://bestbuddiespetcare.net/uploads/1/3/0/2/130287457/nujuzomejorixad.pdf
    • http://knwrzn.com/uploads/1/3/0/2/130287738/7ff14a30467226d.pdf
    • http://dekorartis.com/uploads/1/3/0/5/130588443/zibizoziwanezik.pdf
    • http://avalanchebruidsboeketten.nl/uploads/1/3/0/5/130539108/2154c65481da.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dc4.bin
836a0761bf95579f9586a0d83246041e183c7a57ac675868241bf03ec0f047d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC4 8008 bytes
font_01_sfnt_off00008ce7.bin
9680ae922d04f101e34702b2c1fbbaf56ecad1ebd534e44bded8b6cf148c216e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE7 16652 bytes
font_02_sfnt_off0000a3bf.bin
5f0d5f8cea897397b233ce8affaf7282ee1b4afb28af28a66091a15da2df798a
pdf-font-stream PDF embedded font (sfnt) at offset 0xA3BF 7236 bytes