Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f540ca922a8b05b…

MALICIOUS

PDF

41.2 KB Created: 2020-04-11 03:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 349a5f6dcf478114a39466eb91bf182d SHA-1: 575000dce643a00eee936b741c6f5a35b69aa9cb SHA-256: 1f540ca922a8b05be21dfdc876bec38e5e9775e3f90f0e8ef33d997e0b0b4658
94 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the presence of a link farm, suggesting the primary goal is to drive traffic to potentially compromised or malicious domains.

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://hotelvic-phase2-ko.devsite-1.com/uploads/1/3/1/1/131163660/131163660.html#international+economics+salvatore+pd
    • http://hunnelllaw.com/uploads/1/3/0/3/130324119/merinapulida.pdf
    • http://teaguildofcanada.ca/uploads/1/3/0/6/130604702/fanosofukuzur.pdf
    • http://ibnpercy.com/uploads/1/3/1/4/131483110/lebukemofa_fojasibubuz_tatuperazo_movevifegagir.pdf
    • http://camillemosesallen.com/uploads/1/3/1/0/131071057/gobenoluwurelow.pdf
    • http://meshbio.net/uploads/1/3/0/8/130874055/41cb81edaf00.pdf
    • http://peggyshousecleaningservices.com/uploads/1/3/0/2/130272363/pasatutok.pdf
    • http://tymartinstudios.com/uploads/1/3/0/3/130323250/koparowurakodel.pdf
    • http://criterionproperties.net/uploads/1/3/0/9/130969291/lofoxer.pdf
    • http://juliekocherzinkus.com/uploads/1/3/1/3/131380094/xidobonunarigus-pofeb-miwoli.pdf
    • http://saitbah.com/uploads/1/3/0/7/130739495/8990720.pdf
    • http://nycfurnishedrentals.us/uploads/1/3/0/5/130551416/1f4f8720dfa7701.pdf
    • http://annietotherescue.com/uploads/1/3/0/3/130313539/3f65a29a4565.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006411.bin
08a41c9465dce0b4dee264542944c28e79eacd0f4e4b1c13e88bac48f9f70be6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6411 8192 bytes
font_01_sfnt_off000083d2.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D2 16036 bytes

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