Malicious PDF — malware analysis report

Static analysis result for SHA-256 433cc6edf675ce44…

MALICIOUS

PDF

67.4 KB Created: 2020-03-12 08:25:24 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: 8351ab1e77acc79d64a769bf8e18912f SHA-1: f72b668f9a3d47bde3bd65051aa0b4bb0304cf95 SHA-256: 433cc6edf675ce4427bfca6d5bc67d6b99a43b95213ce787c6a6c06386d1b14a
96 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or SEO poisoning tactic. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, indicating it was likely generated programmatically 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://uibffworld.org/uploads/1/3/1/0/131069753/131069753.html#aggregatibacter+actinomycetemcomitans+ppt PDF link annotation
    • http://acvcphilly.org/uploads/1/3/0/6/130604074/sawinojudawev.pdfIn PDF document text
    • http://spectrum-capital.com/uploads/1/3/0/3/130324340/98b1d5741b2.pdfIn PDF document text
    • http://roofingincentralarkansas.com/uploads/1/3/0/7/130740385/4231808.pdfIn PDF document text
    • http://barsportpobla.com/uploads/1/3/0/4/130436130/lajonimevurejoj.pdfIn PDF document text
    • http://www.carolgremillion.com/uploads/1/3/0/7/130775832/8358188.pdfIn PDF document text
    • http://mail.artofgg.com/uploads/1/3/0/3/130323260/lolomimopir.pdfIn PDF document text
    • http://skinrenewsolution.com/uploads/1/3/0/7/130739399/cc6a5.pdfIn PDF document text
    • http://pzhealthysnacks.com/uploads/1/3/0/2/130274166/1a6ff0b3493e.pdfIn PDF document text
    • http://hotspot.executiveinnoakland.com/uploads/1/3/0/6/130604808/a2d9915662eb7.pdfIn PDF document text
    • http://www.photoandpixels.com/uploads/1/3/0/7/130738721/papapofaviwamoputo.pdfIn PDF document text
    • http://hostmaster.deine-zimmerei.de/uploads/1/3/0/2/130287839/vovifokowof.pdfIn PDF document text
    • http://lipstickcellphonepurse.com/uploads/1/3/0/5/130545249/pidatobikubik-vafejakededa-zesiv.pdfIn PDF document text
    • http://mta-sts.mail.blue87.com/uploads/1/3/0/8/130874244/kozadunimodiwifo.pdfIn PDF document text
    • http://aclearermind.co.uk/uploads/1/3/0/2/130270753/buperoboninisok.pdfIn PDF document text
    • http://attentionaustin.com/uploads/1/3/0/7/130738914/jifeb_betevenati.pdfIn PDF document text
    • http://neubacher.vafercapital.com/uploads/1/3/0/6/130639528/d3f9e303f9f1d.pdfIn PDF document text
    • http://foveor.com/uploads/1/3/0/7/130739488/278929.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_off0000bbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE6 9228 bytes
SHA-256: bfd6d1353bdd8f1ba5de753060e7cb2bc6b659fc3d61c50df7db301c92df5286
font_01_sfnt_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 2864 bytes
SHA-256: 6dc6e07f93ae70488a19e8a398a1c6cda2f5723fc3d3cbe180c5afbb10c3611e
font_02_sfnt_off0000e888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE888 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63

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