Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f673d1ec8828f8f…

MALICIOUS

PDF

53.1 KB Created: 2020-05-22 02:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 293b3c3842479e3ab607a4dfcb9f5c16 SHA-1: d27063698b2cb199b132a58d44df64061a0a4166 SHA-256: 9f673d1ec8828f8f91afdeef0e97573cd613d9f4af2964e341bb60a7a34162d7
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a link farm or SEO spam tactic, potentially used to distribute malware or lead users to phishing sites. No scripts were extracted from this sample.

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://adsl-63-204-18-43.benefitplans.org/uploads/1/3/0/6/130621127/130621127.html#etica+para+amador+fernando+savater+resumen
    • http://birchcreekbeef.com/uploads/1/3/1/3/131383753/8914745.pdf
    • http://the-weed-shop.com/uploads/1/3/0/6/130639037/3650023.pdf
    • http://mayorjoeayoub.com/uploads/1/3/0/7/130738658/394d33c7071.pdf
    • http://jenntreado.com/uploads/1/3/1/4/131453330/rivorojegepadike.pdf
    • http://bodybyjacob.com/uploads/1/3/1/6/131606491/20188.pdf
    • http://salonrayshell.salonrayshell.com/uploads/1/3/1/8/131856995/migaveve-bamutemus-repigojij.pdf
    • http://onestoprenovating.com/uploads/1/3/0/4/130476277/pelebilenukozif-gawowozupi-wunis-bazit.pdf
    • http://bloo-bamboo.com/uploads/1/3/0/9/130969308/sabifuwudale.pdf
    • http://mexicoluminaria.com/uploads/1/3/0/6/130604201/wejenoni_fasozavivokag_moxiw_gimoju.pdf
    • http://walshzubiate.com/uploads/1/3/0/3/130313194/1641913.pdf
    • http://totalaco.org/uploads/1/3/1/3/131398362/lugiminojabixet_vuwuv.pdf
    • http://techgearcases.com/uploads/1/3/0/4/130483617/2489501.pdf
    • http://worcesterbrickbox.net/uploads/1/3/0/7/130775475/8971536.pdf
    • http://scoopsphotography.com/uploads/1/3/0/6/130621772/vojuxaloxu.pdf
    • http://weldingrepair.net/uploads/1/3/0/2/130272356/f59eed6c32883b8.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_off0000a1c5.bin
8f36295ff4e0e3527b2e062daf1d9cee6de354ed7774409ab004733cc671171b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1C5 11468 bytes

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