Malicious PDF — malware analysis report

Static analysis result for SHA-256 7280eddf09fe42f2…

MALICIOUS

PDF

52.7 KB Created: 2020-04-09 20:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 40e410dfcc6953322708475ae8a64fc5 SHA-1: 7b77edb538157350386631cf95f08cdcb44a11de SHA-256: 7280eddf09fe42f2259e47d0b558598a33c61485f8d626b8bf477b9cb1b65cef
104 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are numerically or generically named PDFs, suggesting a link farm for SEO or to host malicious content. The document body, though corrupted, contains a URL that appears to be a lure for downloading a movie, which is a common social engineering tactic. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://electricprosworcester.com/uploads/1/3/0/6/130621487/130621487.html#jurassic+park+mp4+movie+in+hindi
    • http://georgealex.com/uploads/1/3/0/7/130739879/kuvigebalafo.pdf
    • http://theanomalouskrafter.com/uploads/1/3/1/4/131453252/megaz_pufogewokib_fevodarumabeviv.pdf
    • http://hartconsulting.info/uploads/1/3/0/2/130291589/8581209.pdf
    • http://pawsclawsetc.com/uploads/1/3/0/7/130739007/9919738.pdf
    • http://bcattic.com/uploads/1/3/0/7/130739720/koketixagigax_mezopigojab.pdf
    • http://dropshiponlinenow.com/uploads/1/3/0/6/130605259/fewodikutip.pdf
    • http://sternbarnard.com/uploads/1/3/1/1/131164121/9857329.pdf
    • http://hearnownola.com/uploads/1/3/0/4/130483769/zamoworaz.pdf
    • http://deblokletter.be/uploads/1/3/0/7/130739267/penopuxum-nufetewane.pdf
    • http://atotulsa.com/uploads/1/3/0/6/130639510/3f3d75d852.pdf
    • http://jefflavender.com/uploads/1/3/0/6/130603827/cea4bcc.pdf
    • http://limetry.com/uploads/1/3/0/5/130589276/7550151.pdf
    • http://jonathanichiang.com/uploads/1/3/1/3/131383424/pivanu-puzazeba-zavovisorodake-mopomelexor.pdf
    • http://fedorahosted.org/lohit
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069ef.bin
b1118302c5517eb61a6a239cbb0c0398f36a596cc95e76ebefef7294164c1510		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69EF 7316 bytes
font_01_sfnt_off00007ca6.bin
94503a71969105c417746ae2993a41da2b20c25e259b182d2b492ab56eaae7d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA6 8520 bytes
font_02_sfnt_off00009d91.bin
1723f1ced37cc89d69e30f3df6281c5e5fb8989544fd4587aa75b00c91af2fd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D91 1388 bytes
font_03_sfnt_off0000a4f7.bin
e0e3c17e77d4e8eb6c15310c6c8e4d0b1bb105d92337a8b1fee52ec7364f50f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4F7 11064 bytes

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