Malicious PDF — malware analysis report

Static analysis result for SHA-256 001ba4541ee110c2…

MALICIOUS

PDF

74.2 KB Created: 2020-03-10 14:55:10 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 99cd195c4ab851a7e3184186672bf14a SHA-1: 1d5a9079476e80c0c97fd4552fc2b089dde393ba SHA-256: 001ba4541ee110c2d2068203b2dde28d9ce28993ce93e897605f89112e6adacd
96 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The embedded document body text, though partially corrupted, contains references to news and the wkhtmltopdf tool, indicating it was likely generated programmatically to host these links.

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://sipsandtripstravel.voyagerwebsites.com/uploads/1/3/0/2/130288962/130288962.html#anandabazar+patrika+yesterday+news+in+bengali+language+page
    • http://clean-cooling.org/uploads/1/3/0/5/130539085/2401040.pdf
    • http://rose-annerussell.com/uploads/1/3/0/7/130739046/a97687ca8bd.pdf
    • http://rocketrydb.net/uploads/1/3/0/6/130620981/916322.pdf
    • http://ssteeleenterprises.com/uploads/1/3/0/6/130639725/9956889.pdf
    • http://blackcatsculpture.com/uploads/1/3/0/6/130620512/balilozifefaler.pdf
    • http://ddtransit307.com/uploads/1/3/0/4/130436093/gigatorukatutosege.pdf
    • http://writepretty4me.com/uploads/1/3/0/8/130815351/877948b.pdf
    • http://solizagency.com/uploads/1/3/0/2/130272384/gabatip.pdf
    • http://southernangelboutique.net/uploads/1/3/0/4/130436017/8867274.pdf
    • http://hiringamericamarketplace.com/uploads/1/3/0/8/130813616/dedopep.pdf
    • http://access2offshore.com/uploads/1/3/0/4/130436389/xipusodijeti_lesis.pdf
    • http://saurabhbhatt.com/uploads/1/3/0/7/130738863/lafuxovosa.pdf
    • http://amoagallery.com/uploads/1/3/0/6/130621301/tetukosinepugelimeni.pdf
    • http://www.perfectfixhandyman.com/uploads/1/3/0/2/130288775/6737038.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009d8f.bin
8088606acf0201d6ee4cfee6bfa344e4283d648493ef3eca213b7a2196c2ac2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D8F 7176 bytes
font_01_sfnt_off0000b9f9.bin
1723f1ced37cc89d69e30f3df6281c5e5fb8989544fd4587aa75b00c91af2fd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F9 1388 bytes
font_02_sfnt_off0000c15f.bin
1cddcc7c2ae79fb57e50c6f0e1dced6ca3995a88e88b033cb885b42fd4c0f292
pdf-font-stream PDF embedded font (sfnt) at offset 0xC15F 30300 bytes