Malicious PDF — malware analysis report

Static analysis result for SHA-256 719f13e22093101d…

MALICIOUS

PDF

32.3 KB Created: 2020-04-10 02:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f56e4d9261930fdf0a15b5e7627091cf SHA-1: 68b6dfddc901866c738e692f10e9f7fb3a92c63a SHA-256: 719f13e22093101d0771d03d9f0030dfa7e848f79bc50e5bf283611cbbf7f78d
96 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing indicating a 'PDF_SEO_LINK_FARM', suggesting it's designed to host a large number of external links. The document body and extracted URLs confirm this, pointing to numerous PDF files hosted on various domains. This pattern is often used for SEO manipulation or to distribute malicious payloads, hence the high confidence in a malicious intent.

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://peacebros.org/uploads/1/3/1/1/131163984/131163984.html#say%C4%B1sal+kale+matematik
    • http://careplusconnect.com/uploads/1/3/0/6/130639396/1742c189fb2b4.pdf
    • http://konshensklean.com/uploads/1/3/0/5/130545185/7483945.pdf
    • http://bcocobrands.com/uploads/1/3/0/6/130621190/fiwusolufenikulexiso.pdf
    • http://doctorreinvented.com/uploads/1/3/0/6/130639802/dagapotudepedur_dexovejojagusol.pdf
    • http://reaganalumni.network/uploads/1/3/0/7/130775632/nulekowuwad_fikememuvazeg_birazag_fimaxinigutomew.pdf
    • http://kleenlabel.com/uploads/1/3/0/3/130323568/jaror.pdf
    • http://nimbledevices.com/uploads/1/3/1/0/131071072/kupidogevekip.pdf
    • http://lindseybphotography.com/uploads/1/3/0/4/130475925/bixiv.pdf
    • http://yourgirlwithadd.ca/uploads/1/3/0/5/130547150/99a967.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_off00005409.bin
0357f2c26d43b3e217fa9f3813fb461558a2500cd4b9367f535b2847a2b798d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5409 8804 bytes

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