Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f36bcf916548db…

MALICIOUS

PDF

38.5 KB Created: 2020-03-07 14:20:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3c2f90235e1971514002a6c1b0dc8fbe SHA-1: 1640b84c58a0410c8f067e57d0dbfe0f7dce5af1 SHA-256: 33f36bcf916548db7d5582bfdeff6c17ac460e0e5e8778b9badf1e906528e32a
96 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external PDF files hosted on various domains. The embedded URLs and the heuristic firing for PDF_SEO_LINK_FARM indicate a malicious attempt to distribute or link to potentially harmful content. The ML classifier strongly supports the malicious nature of this file.

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://www.dj3po.com/uploads/1/3/0/4/130488604/130488604.html#adverb+clause+vs+prepositional+phrase
    • http://downtothefelt.com/uploads/1/3/0/7/130776478/8194651.pdf
    • http://www.kalliristi.co.uk/uploads/1/3/0/4/130489253/fifigi.pdf
    • http://nuevaconciencia.info/uploads/1/3/0/4/130476410/3522201.pdf
    • http://heshengchen.com/uploads/1/3/0/6/130639721/zekosuk.pdf
    • http://theoxfordhouseofbeauty.com/uploads/1/3/0/2/130271103/6666802.pdf
    • http://bydsatelier.com/uploads/1/3/0/3/130323213/7b1439c.pdf
    • http://sochicompany.com/uploads/1/3/0/5/130543600/9650064.pdf
    • http://mail.interfaithleaders.org/uploads/1/3/0/3/130313105/5244477.pdf
    • http://olsonphotographystudio.com/uploads/1/3/0/7/130775135/f3d3e326d0172.pdf
    • http://infectiousproductions.com/uploads/1/3/0/6/130639879/lolako-fopozogomon-xukefawopig-fovedi.pdf
    • http://kylecouchproeprties.com/uploads/1/3/0/6/130605426/4f8a8191738e1a.pdf
    • http://carnesupremabrangus.com/uploads/1/3/0/6/130621243/9bf8e0.pdf
    • http://crestanello-sett.com/uploads/1/3/0/6/130639613/32b2ae774ffb61.pdf
    • http://106redirect.com/uploads/1/3/0/4/130435717/4238436.pdf
    • http://metrowalkatlanta.org/uploads/1/3/0/5/130540746/c3a6c98c.pdf
    • http://securerisc.com/uploads/1/3/0/2/130289652/vamufa.pdf
    • http://cavsummit.com.au/uploads/1/3/0/6/130639221/saliledazamibi_lejepo_gevukokebedobip_xizakugumo.pdf
    • http://ocmedicare.net/uploads/1/3/0/5/130550992/wafinutata.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_off00006e2e.bin
57d4fef3ead6c564e90878ce274b947bd837d863a92a5cc06f230a41a2384f75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2E 7800 bytes

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