Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5b2d4b7d64c929…

MALICIOUS

PDF

43.8 KB Created: 2020-04-02 00:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d900f5392ad5d7710b7cdfcf26c01520 SHA-1: 8fd0d5f768cf9e509f0d833ba5f3d9a49fac62d0 SHA-256: ff5b2d4b7d64c929322550c4c44b29bad268c3d1c01980b0ec4d8ead2ab752d7
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, while containing some text, is heavily obfuscated and appears to be a lure for the embedded links. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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://block1949-asu.com/uploads/1/3/0/8/130874238/130874238.html#free+baritone+ukulele+chord+chart
    • http://basementwaterproofingmen.com/uploads/1/3/1/4/131407021/dalefapopip.pdf
    • http://buda.ee/uploads/1/3/0/8/130874439/tajox.pdf
    • http://newtonstree.services/uploads/1/3/0/6/130604782/4172231.pdf
    • http://ryegentrytrucking.com/uploads/1/3/0/4/130483725/68b1931.pdf
    • http://ybag.info/uploads/1/3/0/7/130740444/vimamapuke.pdf
    • http://corodemia.com/uploads/1/3/1/3/131383720/lokiz.pdf
    • http://www.heybev.com/uploads/1/3/0/5/130550938/6063499.pdf
    • http://boulderforensics.com/uploads/1/3/0/7/130739363/6364676.pdf
    • http://kandlelightmoments.com/uploads/1/3/0/4/130483773/6348406.pdf
    • http://lorenzettiinformatica.info/uploads/1/3/0/2/130287542/872678.pdf
    • http://hhinternational.net/uploads/1/3/0/6/130604617/gukawebetajuzeru.pdf
    • http://rnrinc.org/uploads/1/3/0/5/130589430/divemufeluxu_dakudijezi_pakuga_rixupufaxofa.pdf
    • http://inspire-and-empower.com/uploads/1/3/0/4/130436152/metolev-miwanori-nenomazulozum-gomalepo.pdf
    • http://talesoftwotravelers.com/uploads/1/3/0/9/130969742/8c44f2ccceb6d77.pdf
    • http://920meats.com/uploads/1/3/1/3/131378915/vawakuredufenod-rupijaz.pdf
    • http://atinaservices.com/uploads/1/3/0/2/130291545/bafegi.pdf
    • http://workhealthfaq.com/uploads/1/3/0/7/130775242/8688923.pdf
    • http://upstagesptcitycomplaint.com/uploads/1/3/0/5/130588352/mebovusoralem_luwuf.pdf
    • http://amadeudesign.com/uploads/1/3/0/2/130272609/mivudobosu_jasetixi_vovubedegul.pdf
    • http://josephewondejr.com/uploads/1/3/0/4/130483043/1758931.pdf
    • http://mundotainos.com/uploads/1/3/1/3/131398475/bavunanibozen.pdf
    • http://sylphmedia.com/uploads/1/3/0/8/130813427/777bcd.pdf
    • http://mirehabsolutions.org/uploads/1/3/0/7/130776428/9725486.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077fa.bin
1373578b1f6b3a9078a747e54f0ac23a5f414ade168ce0607ea57267a1f23049		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77FA 8256 bytes
font_01_sfnt_off000097c5.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97C5 2616 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.