Malicious PDF — malware analysis report

Static analysis result for SHA-256 6091798d13e3a1cf…

MALICIOUS

PDF

35.6 KB Created: 2020-03-07 12:24:32 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a2b493f36794804bd6342262bb36e7a4 SHA-1: a03a100491d2f5fff4cce2b9d56ecb0b0384ce39 SHA-256: 6091798d13e3a1cf21ae5a16995630e7dd8d5177cd99e38df4718b288495075b
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were directly extracted, the structure suggests the PDF is designed to drive traffic to these external URLs, which could host further malicious content or phishing pages.

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://adsl-63-204-18-62.benefitplans.org/uploads/1/3/0/6/130604083/130604083.html#atherosclerosis+heart+disease+nursing+diagnosis
    • http://loveismotivation.com/uploads/1/3/0/4/130435672/bovif.pdf
    • http://mbmariie.com/uploads/1/3/0/6/130603803/a5ea81ccd563b.pdf
    • http://yxkbq.butterfly520.com/uploads/1/3/0/4/130435514/33836757.pdf
    • http://ellaayalon.org/uploads/1/3/0/6/130621143/3217528.pdf
    • http://mail.towsondancestudio.com/uploads/1/3/0/2/130271190/a9c4a.pdf
    • http://mail.greybytori.com/uploads/1/3/0/5/130551559/bc5a22eaa79bc1.pdf
    • http://111-pod.site/uploads/1/3/0/7/130775646/lupofuripe_ruvago_bevuto.pdf
    • http://www.cadeim.com/uploads/1/3/0/9/130969424/acfe88f767b.pdf
    • http://blockchainmodels.net/uploads/1/3/0/2/130291036/bf3db9e0b705.pdf
    • http://dudetree.com/uploads/1/3/0/5/130588688/25a221c.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051d9.bin
f6f3060b8ac1068b6e5136071aba8076240d87e3677b72d9915f644af75800ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51D9 6696 bytes
font_01_sfnt_off00006c67.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C67 16036 bytes

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