Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21d5243fc92eb97…

MALICIOUS

PDF

35.6 KB Created: 2020-04-03 12:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: ba96b023397ceddb38f47fa580b45e22 SHA-1: 1933cd9e19ebd96b4498b90b4c109237078c9fe5 SHA-256: f21d5243fc92eb9729b7f5bf71986cf9f00ec5c40582dca1579864f6f5ab63f0
136 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body text is largely unreadable due to encoding issues, but the presence of the URL http://ardmacelectric.com/uploads/1/3/1/3/131398385/131398385.html#safety+first+baby+gate+video suggests a lure. The primary attack pattern involves directing users to a vast network of linked websites, likely for SEO spam or to host further malicious content.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ardmacelectric.com/uploads/1/3/1/3/131398385/131398385.html#safety+first+baby+gate+video PDF link annotation
    • http://naturalandpermanentbodyadornment.com/uploads/1/3/0/9/130969570/fabik_xasitesejul.pdfIn PDF document text
    • http://cpanel.toastnjams.com/uploads/1/3/1/1/131163638/gomixirupodafojode.pdfIn PDF document text
    • http://thefutureofyou.info/uploads/1/3/0/4/130476751/146249c1d43.pdfIn PDF document text
    • http://helpadogbbq.com/uploads/1/3/0/6/130621124/1110479.pdfIn PDF document text
    • http://austinartistdevelopment.com/uploads/1/3/0/4/130435780/9726156.pdfIn PDF document text
    • http://simmssteamcleaning.com/uploads/1/3/0/8/130874370/lilom_juzotevijomef_rigubebatipowa.pdfIn PDF document text
    • http://sarahkleinsantacruz.com/uploads/1/3/1/0/131070071/909676.pdfIn PDF document text
    • http://trilogyhomes.org/uploads/1/3/0/6/130639178/9800058.pdfIn PDF document text
    • http://andrianaediting.ca/uploads/1/3/0/5/130545429/semixexu_gimizajitigi_kepawi_ketowikade.pdfIn PDF document text
    • http://waikato-mobility-equipment.org/uploads/1/3/0/2/130273625/kamup.pdfIn PDF document text
    • http://lcalmarketing.com/uploads/1/3/0/8/130814652/199c41d144.pdfIn PDF document text
    • http://mta-sts.mx.lucioconstructioninc.com/uploads/1/3/1/4/131453843/rubixakifu.pdfIn PDF document text
    • http://kidsstandforcharities.org/uploads/1/3/0/5/130588203/nupijijefi.pdfIn PDF document text
    • http://hoopshouse.net/uploads/1/3/0/9/130969404/duxusinomifuvitizo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66FB 6592 bytes
SHA-256: b4121c50def0689fb2bd80ebb4fd83c07c9143407894e00b75672bb1d0c057fd

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