Malicious PDF — malware analysis report

Static analysis result for SHA-256 681e00e386bcb961…

MALICIOUS

PDF

47.7 KB Created: 2020-05-12 07:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e2ac2dfd8e247492167f5e63e54d2904 SHA-1: 0cc29be3c879a590ab746d6154d9c9a7346e737a SHA-256: 681e00e386bcb961d42bf46c5e80b8a238cccf6ec3279f839c2578b7b2fb60f8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to other PDFs hosted on various domains. This suggests a link farm or a method to distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a 'download' lure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hockeystrength.ca/uploads/1/3/1/8/131857818/131857818.html#halftime+report+fox
    • http://polarismassagetherapy.com/uploads/1/3/1/8/131872130/306151efc3.pdf
    • http://dancingarrowresources.com/uploads/1/3/0/4/130477864/xikezodawulixogezod.pdf
    • http://enactum.net/uploads/1/3/1/0/131070279/texafefuzorumete.pdf
    • http://cryptocurrencymadness.com/uploads/1/3/0/4/130483795/c5d2a2b69d.pdf
    • http://churchillclubmedia.org/uploads/1/3/0/2/130288707/mezanujavokuxeg.pdf
    • http://theunlikelytourist.com/uploads/1/3/1/8/131856369/9675360.pdf
    • http://chrisrobertsschoolofmusic.com/uploads/1/3/0/3/130312952/kerokeluzak.pdf
    • http://dccarescenterinc.com/uploads/1/3/1/0/131069839/f3494b7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000910b.bin
5f9164f62ff0e96c042dc903b748c28587aa50985cde0fa96015eb2dadce95a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x910B 10576 bytes

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