Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f57563982663142…

MALICIOUS

PDF

33.1 KB Created: 2020-04-09 23:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: af91ec5557eb817228fc7d626523d223 SHA-1: e8691b396e57a1f7d34bc532f9d3a68f600ae2fe SHA-256: 2f5756398266314249691e1bc4521d7c79e2aa9ec6ff01450e93013273d8232c
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which are structured to appear as SEO-optimized content, suggesting a link farm or phishing lure. The heuristic 'PDF_SUSPICIOUS_LINK_LURE' specifically indicates an invisible link to a suspicious domain, 'server-secure-portal9.online'. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the extensive linking and evasion techniques point towards a delivery mechanism for malicious content hosted on external sites.

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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://geekygreengirl.com/uploads/1/3/1/3/131398235/131398235.html#pokemon+zeta+and+omicron+speed+up PDF link annotation
    • http://foreverychildren.org/uploads/1/3/1/4/131437465/nusutobu-tobofu-xemafopus.pdfIn PDF document text
    • http://newhavenclients.com/uploads/1/3/0/7/130739916/moworuli.pdfIn PDF document text
    • http://brandonjayfoster.com/uploads/1/3/0/7/130775116/2179786.pdfIn PDF document text
    • http://hillspoolservices.com/uploads/1/3/0/4/130476152/f18df.pdfIn PDF document text
    • http://god-almighty.com/uploads/1/3/0/6/130640142/d86c8a.pdfIn PDF document text
    • http://mtgileadbaptistchurch.com/uploads/1/3/0/4/130489143/fefc0f093e9c998.pdfIn PDF document text
    • http://kingdombedding.com/uploads/1/3/0/6/130603948/xolubibuvopepam.pdfIn PDF document text
    • http://rubbercityshakes.com/uploads/1/3/0/6/130620880/xeladoxaru.pdfIn PDF document text
    • http://tanju.nyc/uploads/1/3/0/8/130814805/metunazuxereduv.pdfIn PDF document text
    • http://tripgent.com/uploads/1/3/0/5/130551386/bolalujefaja.pdfIn PDF document text
    • http://server-secure-portal9.online/uploads/1/3/1/4/131437925/tukemavidisulat.pdfIn PDF document text
    • http://mynewdomainlive.com/uploads/1/3/0/4/130488357/zedusig_wurav_sirob_woxesoxekowoxom.pdfIn PDF document text
    • http://escapekewanee.com/uploads/1/3/1/3/131384306/d39a91ee61f4e.pdfIn PDF document text
    • http://michelleberceau.com/uploads/1/3/1/4/131406945/mimivazutuzof.pdfIn PDF document text
    • http://katieamandamyers.com/uploads/1/3/0/8/130814774/donutomapumox_xowulelub_wevov_nuwabe.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 7

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_off00005912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5912 7936 bytes
SHA-256: 1a1a11750020d031d8a908bb43bb71d4873eb11de6543f58f6c4b639f41cddfd

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