Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4a13bd037cd8df…

MALICIOUS

PDF

130.2 KB Created: 2020-03-21 19:46:32 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-07-24
MD5: ce3987d4468edb032a8b36aef7f99904 SHA-1: f8ec182dec88da9cb9655f50c509d850e6024045 SHA-256: 7b4a13bd037cd8dfdfee6f27f1533acdb67ddefa1bb4487db8e9d0fbb0ee4132
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of external links to various domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URLs supports this assessment. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, suggesting the primary purpose is to redirect users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://flyingmonkeygarage.com/uploads/1/3/0/2/130271205/130271205.html#historia+del+futbol+pdf+resumen PDF link annotation
    • http://recipetracks.com/uploads/1/3/0/3/130313398/1494507.pdfIn PDF document text
    • http://blusunbeauty.com/uploads/1/3/0/4/130477633/xufaliwapomi.pdfIn PDF document text
    • http://dinosgrilledburger.com/uploads/1/3/0/4/130476732/86fda65c6f91.pdfIn PDF document text
    • http://justrightdm.gruupmeet.com/uploads/1/3/0/6/130605206/c856b97184bf92.pdfIn PDF document text
    • http://burchettequine.com/uploads/1/3/0/8/130814250/6741382.pdfIn PDF document text
    • http://wmaxconsulting.com/uploads/1/3/0/6/130639652/retovawig.pdfIn PDF document text
    • http://www.oroshaziingatlan.com/uploads/1/3/0/5/130544240/derawofo.pdfIn PDF document text
    • http://xtremexxlbullyz.com/uploads/1/3/0/8/130813663/zelenojiwum.pdfIn PDF document text
    • http://medistay.org/uploads/1/3/0/6/130621909/ea26045a9833.pdfIn PDF document text
    • http://paycationpeprally.com/uploads/1/3/1/0/131070115/fc648.pdfIn PDF document text
    • http://rosecityinspections.com/uploads/1/3/0/7/130776393/610d4a5815b.pdfIn PDF document text
    • http://mx.mx.cheyenne.space/uploads/1/3/0/6/130604445/miwoxelikak-wiruridelola-mitujoladaxe.pdfIn PDF document text
    • http://www.turbo23.es/uploads/1/3/0/2/130289597/2361272.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_off0001b22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B22C 11932 bytes
SHA-256: 9fef0759358c9682dd1fafd536f6d9af5884c09197f14c1ca1e7c78318208460
font_01_sfnt_off0001da1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA1D 2732 bytes
SHA-256: 0ef1112e50e2a86488aadde4d8a477a3649c66578d8f2a84f2c6ad20bbddbbf8
font_02_sfnt_off0001e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3CA 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63

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