Malicious PDF — malware analysis report

Static analysis result for SHA-256 72478a220a336795…

MALICIOUS

PDF

41.4 KB Created: 2020-03-28 10:39:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5d9eb744f380862002349e6f1e044c17 SHA-1: 8fe93a0696ccb545bc5df69d37fc9325309a7caf SHA-256: 72478a220a3367959ecdb8e71616dd8323d3cbcf8dec3d904548e204dca870f7
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or content distribution tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports a high-risk assessment. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to redirect or host malicious content.

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://kalajarvenlomakyla.fi/uploads/1/3/1/4/131437831/131437831.html#kensington+keyfolio+pro+plus+manual
    • http://www.propinquityretreats.com/uploads/1/3/0/8/130814227/roxenidelorub_mepigerejopega.pdf
    • http://barbarabrancaccio.com/uploads/1/3/0/9/130969868/1c9a7f606.pdf
    • http://webdisk.irishoil.ie/uploads/1/3/0/6/130604423/ratalu_xekisuzalufo_fovewu.pdf
    • http://edela.net/uploads/1/3/0/3/130323957/2db3069e44985.pdf
    • http://livroartlantis.com/uploads/1/3/0/5/130589004/lewiruwagewufej.pdf
    • http://www.pensandpaints.com/uploads/1/3/1/0/131070325/zefamuxupevame_varozejanijir_xemaripepa_vuravimawu.pdf
    • http://johnhancockcenterchicago.com/uploads/1/3/0/6/130604575/6d25d80a15969.pdf
    • http://frenchtownproperty.com/uploads/1/3/0/6/130639509/7321208.pdf
    • http://patiocoverideas.net/uploads/1/3/0/6/130639669/derolilimibuzado.pdf
    • http://casserolegreenville.com/uploads/1/3/0/6/130640029/8410a84e5.pdf
    • http://jennylashwell.com/uploads/1/3/0/4/130483397/zovobo.pdf
    • http://javawraps.com/uploads/1/3/0/8/130813732/9c2f6c2f20fe.pdf
    • http://moneyoffyourfeet.com/uploads/1/3/0/5/130545565/xevufuparo.pdf
    • http://gifas-committee-china.com/uploads/1/3/0/4/130435594/7389479.pdf
    • http://mayefairartsfestival.com/uploads/1/3/0/5/130588618/0bf96a9be8e722.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_off0000604b.bin
bdbe7eee9e3477b06b109fe953c0ec5e6411b057ca41b0a7028d519b12f02828
pdf-font-stream PDF embedded font (sfnt) at offset 0x604B 10812 bytes
font_01_sfnt_off000082ca.bin
0f23141ba94d37b49c53016ac63a9b008a6ac8e4c4656a8d80e6725f77750189
pdf-font-stream PDF embedded font (sfnt) at offset 0x82CA 16140 bytes