Malicious PDF — malware analysis report

Static analysis result for SHA-256 432f585dcae86eba…

MALICIOUS

PDF

49.5 KB Created: 2020-03-26 04:10:57 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 58452a7bb84cc239e9733af9dc6c6a78 SHA-1: a8776bd238735e2267253e067f927c5a6a8679fc SHA-256: 432f585dcae86eba6e94ac45dea3661d42b9559b680909eca66e0c38f80bcd6a
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted on various domains. This technique is often used for SEO poisoning or to distribute malicious payloads. The document body contains garbled text and what appears to be metadata from the wkhtmltopdf tool, suggesting it was programmatically generated to host these links. No scripts were extracted from this sample.

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://sdrvowners.org/uploads/1/3/0/8/130814178/130814178.html#cual+es+el+c%C3%A1ncer+linf%C3%A1tico PDF link annotation
    • http://knuteanderson.com/uploads/1/3/0/8/130874210/tetimeju.pdfIn PDF document text
    • http://1123rd.com/uploads/1/3/0/5/130539305/rowifanebi.pdfIn PDF document text
    • http://bernardobellostudio.com/uploads/1/3/0/3/130379651/denopifabubidum.pdfIn PDF document text
    • http://boyinchuzu.br3h.com/uploads/1/3/1/1/131163640/xolakofusew.pdfIn PDF document text
    • http://national-rebar.com/uploads/1/3/0/4/130476611/496596.pdfIn PDF document text
    • http://www.4ufurnituredesign.com/uploads/1/3/0/6/130604795/topufe.pdfIn PDF document text
    • http://www.shelleyscleaning.services/uploads/1/3/0/6/130604918/lubowa.pdfIn PDF document text
    • http://omdoggies.com/uploads/1/3/0/3/130313220/e06bf4187.pdfIn PDF document text
    • http://lopenhaus.com/uploads/1/3/0/4/130435697/6f695d47695.pdfIn PDF document text
    • http://mobileinstallationgroup.com/uploads/1/3/0/6/130639300/duburopobo_dowuvu_lujowu_terodujoxujoz.pdfIn PDF document text
    • http://stellarconcessions.com/uploads/1/3/0/6/130603709/6856865.pdfIn PDF document text
    • http://birkdaleawards.com/uploads/1/3/0/6/130604354/dawaxiz-rewezowepokuxe.pdfIn PDF document text
    • http://jaredjagdeomd.com/uploads/1/3/1/0/131069950/3188561.pdfIn PDF document text
    • http://spaldingretirementsolutions.com/uploads/1/3/0/9/130969194/223958.pdfIn PDF document text
    • http://cookieclear.net/uploads/1/3/0/7/130775135/c6749b76d9d42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7737 9124 bytes
SHA-256: 28c85158631ceb0e9edb8f41ac44caf16ff78bcabe3ebf9cebd877737c612184
font_01_sfnt_off00009812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9812 2652 bytes
SHA-256: e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc
font_02_sfnt_off0000a179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA179 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63

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