Malicious PDF — malware analysis report

Static analysis result for SHA-256 783696c9ce5a6b08…

MALICIOUS

PDF

39.3 KB Created: 2020-04-07 15:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 081a0658d3cac50af99ab657e3a108d0 SHA-1: eede3c82f1629c50c51e2575d73835054d4b34cb SHA-256: 783696c9ce5a6b083886e216e9e4250005f8044065a18e0f0bcf55dc25321736
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ML classifier strongly indicated maliciousness. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

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://cecilyeiferle.com/uploads/1/3/1/4/131406841/131406841.html#la+rese%C3%B1a+critica+estructura
    • http://h4investments.com/uploads/1/3/0/8/130813369/resawava-kakafotuzasomu-zavajawame-jafonagegoribo.pdf
    • http://cleanfootbox.com/uploads/1/3/0/6/130605048/9783077.pdf
    • http://oppgroupllc.com/uploads/1/3/0/7/130739062/lewobad.pdf
    • http://bonsaifund.org/uploads/1/3/0/3/130323705/8101519.pdf
    • http://keepsakemags.com/uploads/1/3/0/4/130476010/jagexudofav.pdf
    • http://shields-data.com/uploads/1/3/0/3/130312912/mejirirap.pdf
    • http://thenestingspot.org/uploads/1/3/0/8/130814342/losaguseruku.pdf
    • http://rayraybeats.com/uploads/1/3/1/0/131071159/xejerokadilapapudenu.pdf
    • http://water-vibe.com/uploads/1/3/0/6/130604129/37122b6931e862.pdf
    • http://portmoodyacupuncture.com/uploads/1/3/0/5/130588545/e7abb232e.pdf
    • http://saltwaterschool.com/uploads/1/3/1/4/131482930/5877556.pdf
    • http://medspalove.com/uploads/1/3/0/3/130313524/9765602.pdf
    • http://domotrade.net/uploads/1/3/0/9/130969434/sefatutef_fevabilivigi_liralawob_gevobimo.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000707d.bin
5937b14bbcf24cb8332289c1df2a4857d2da9307b2ca8f665bf149288ca234e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707D 8176 bytes

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