Malicious PDF — malware analysis report

Static analysis result for SHA-256 6090b8b8a3cb1366…

MALICIOUS

PDF

45.1 KB Created: 2020-06-20 16:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfc2c7c35c822e190f9bad35a10f7926 SHA-1: 4fb1e822907d08ab62e00f20022b6d57ae7d4d76 SHA-256: 6090b8b8a3cb13660f0e0e153fae7fed4d6f5f6866cd60d66a0b338fc13c94f5
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links to external URLs, many of which are algorithmically generated and point to other PDF files. This behavior is indicative of a link farm or a phishing lure designed to redirect users to malicious content. The ML classifier strongly supports the malicious verdict.

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://2yi.undesirable.us/uploads/1/3/1/1/131164114/131164114.html#cassiopeia+guide+s4
    • http://risingindiesunited.com/uploads/1/3/0/7/130738629/265400b664f.pdf
    • http://newhorizonsllchardwoodscustomprofiles.com/uploads/1/3/1/8/131871854/a79fec392fcc5.pdf
    • http://citerne.org/uploads/1/3/1/3/131379598/4056907.pdf
    • http://gameusedsteelers.com/uploads/1/3/1/6/131637219/4398129.pdf
    • http://pumpkinpickinco.com/uploads/1/3/0/6/130639590/sukule-femajan-wuxelisukoletux.pdf
    • http://mx.overthetoprenos.com/uploads/1/3/0/8/130813841/juxefelukibad-nuxofosizuvetim-pusaragimake.pdf
    • http://74-123-73-221.mgwnet.com/uploads/1/3/1/6/131636833/vuromifob_nigajomoxune_gifubasufu_xuwenufulorekil.pdf
    • http://lejardindeclematite.com/uploads/1/3/0/4/130488332/ae3aeb76584d99.pdf
    • http://localhoneymedia.com/uploads/1/3/0/5/130539115/7516062.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/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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073e3.bin
c3e1399d91343b5ec2144e7114d69a2f11fa5d67e404b5400f56c23bcf999ff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E3 4804 bytes
font_01_sfnt_off0000844a.bin
7494fad092cf5fe08fc74e1ca966b02d8a41c324ed17dd98b9fc0de53a13173d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x844A 10540 bytes

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