Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e49cce48b467be…

MALICIOUS

PDF

42.7 KB Created: 2020-03-27 08:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cbe66642da794facf9742d63449182a8 SHA-1: a4f7780b83b9ea8c7d427d787dce012168612727 SHA-256: 98e49cce48b467bee092d2384c83ea1067955b9d8dc8e692a4822f2de90d3e28
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The document body text, though partially corrupted, suggests a lure related to a historical query, likely intended to trick users into clicking the embedded links. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm.

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://ulteriormotion.com/uploads/1/3/0/9/130968976/130968976.html#porque+la+revolucion+industrial+se+produjo+en+inglaterra+yahoo
    • http://institut-vietnam-pacifique.com/uploads/1/3/0/6/130639901/9140782.pdf
    • http://mail.bpresent.org/uploads/1/3/0/3/130379199/2165929.pdf
    • http://www.lori-collins-rim.com/uploads/1/3/0/5/130588533/gaxigigufara-tevipefawitom-vigudapemilu.pdf
    • http://ndmoutreach.com/uploads/1/3/0/6/130604787/jimutub.pdf
    • http://whatsgoingondc.com/uploads/1/3/1/0/131070591/5174432.pdf
    • http://wazyshairsalon.com/uploads/1/3/0/5/130551920/dojir.pdf
    • http://mindovertri.co.uk/uploads/1/3/0/5/130551330/gowokana_jozemulirowaxu_fawodabevone.pdf
    • http://www.rivendellberry.com/uploads/1/3/0/3/130323597/vasavimuxubo.pdf
    • http://rhinotruckparts.com/uploads/1/3/0/6/130604725/2425410.pdf
    • http://littletreepreschooleugene.com/uploads/1/3/0/4/130489149/b74f01c26.pdf
    • http://www.keetolove.com/uploads/1/3/0/8/130874384/3780122.pdf
    • http://nugriot.com/uploads/1/3/0/5/130546385/mokifedufolower.pdf
    • http://beauty-by-bree.net/uploads/1/3/0/5/130547527/piburanodibi_gawexiwu_mujubuw_xuworusedero.pdf
    • http://ramlu.net/uploads/1/3/0/6/130604581/4a22ac9385c8b1.pdf
    • http://www.rripm.com/uploads/1/3/0/6/130620745/5471419.pdf
    • http://www.thefocalpoint-optom.com/uploads/1/3/0/5/130540010/womonekewa-banewo.pdf
    • http://hostmaster.baieslings.com/uploads/1/3/0/2/130274345/4542305.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_off00007c35.bin
6ccc51ec60d09b829ceccb5e895b405f3e238e5b73616f24497dab8499ffa550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C35 8356 bytes

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