Malicious PDF — malware analysis report

Static analysis result for SHA-256 798578f407ba5225…

MALICIOUS

PDF

47.3 KB Created: 2020-03-27 13:02:29 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: 7d5a33276abd7fe1a0d8b5a0886de7f9 SHA-1: 6da79ca7e86aaa39c54fa9792df12c57d4e7b671 SHA-256: 798578f407ba52255e9d9c7a84d47f61b7c9a774beec383884694a7385d1756a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The embedded document body text, though garbled, contains URLs that are consistent with the link farm findings. This suggests the document is designed to redirect users to a large collection of other documents, potentially for SEO spam or to host further malicious payloads.

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://akizusushi.com/uploads/1/3/0/4/130483346/130483346.html#barthelme+the+school+analysis PDF link annotation
    • http://git.innostaa.com/uploads/1/3/0/4/130483795/boritomalegemu.pdfIn PDF document text
    • http://mytextilenotes.com/uploads/1/3/0/7/130740193/1908860.pdfIn PDF document text
    • http://hostmaster.classicalguitar.online/uploads/1/3/0/6/130639500/6371432.pdfIn PDF document text
    • http://northcontractror.com/uploads/1/3/0/9/130969301/fabapeka.pdfIn PDF document text
    • http://musclegearasia.net/uploads/1/3/0/7/130738936/4447352.pdfIn PDF document text
    • http://dev.jcaweb.net/uploads/1/3/1/1/131164009/475d03eb8baa3a.pdfIn PDF document text
    • http://micahsclippings.com/uploads/1/3/0/7/130740363/pezimuxoxi_mekifuwejafiku.pdfIn PDF document text
    • http://hostmaster.myshawlands.com/uploads/1/3/0/6/130639665/ae176ca7726.pdfIn PDF document text
    • http://majickis.com/uploads/1/3/0/6/130604207/6575872.pdfIn PDF document text
    • http://mail.affordablestoragemidland.com/uploads/1/3/0/9/130969515/5287d86c3d248f5.pdfIn PDF document text
    • http://charlzstudio.com/uploads/1/3/0/8/130874114/971166.pdfIn PDF document text
    • http://biancajpx.com/uploads/1/3/0/6/130639982/f12497.pdfIn PDF document text
    • http://acadiaextracts.net/uploads/1/3/0/5/130543771/pozekuzoz.pdfIn PDF document text
    • http://prbymal.com/uploads/1/3/0/8/130813860/jawufeve.pdfIn PDF document text
    • http://cell-connect.ca/uploads/1/3/0/5/130547486/d3be9f.pdfIn PDF document text
    • http://adielgrace.com/uploads/1/3/0/2/130289638/53dc4.pdfIn PDF document text
    • http://nobookingfee.org/uploads/1/3/0/5/130588269/mowusizejopujaw.pdfIn PDF document text
    • http://5pumpkins.com/uploads/1/3/0/9/130969436/6837949.pdfIn PDF document text
    • http://spiritual-research-network.com/uploads/1/3/0/5/130550887/86ace1af9.pdfIn PDF document text
    • http://theresajensenphotography.com/uploads/1/3/0/6/130620464/2822723.pdfIn PDF document text
    • http://tellmesomethinggood.net/uploads/1/3/1/0/131069968/1572322.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA9 7688 bytes
SHA-256: 641537b1f878530b0ca575eeb76e998b1425ac708cdca1f4ab4d4b458677e635
font_01_sfnt_off00009ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB3 16036 bytes
SHA-256: 1a48559509f7f75063a877bee3d72c2f3225c728dd953cebf65f9a5167f6cbd7

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