Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a305ffe7ec4ec80…

MALICIOUS

PDF

36.0 KB Created: 2020-04-05 06:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ef37cf8d62b9285dd836dbefe5d4ec2b SHA-1: 0a03873bbe3ce1c350a679688bd1e4457713345e SHA-256: 5a305ffe7ec4ec806d3c64140d782411eda0de385cbea49cb450e82dc86a66af
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to drive traffic to potentially harmful sites. The embedded content, though garbled, includes URLs that appear to be lures for tutorials, likely to deceive users into clicking. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious attack pattern.

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://bloomhw.com/uploads/1/3/0/8/130814774/130814774.html#diy+loom+bands+triple+single+rainbow+bracelet+tutorial
    • http://theweeklydigest.xyz/uploads/1/3/0/3/130313524/mifagufamapo-muvajen.pdf
    • http://metzkerconsulting.com/uploads/1/3/0/5/130588961/621ab29618d163.pdf
    • http://transyouthchannel.org/uploads/1/3/1/1/131163640/vibix.pdf
    • http://alloneministries.net/uploads/1/3/0/6/130621180/ca896b0872a9d.pdf
    • http://get-solutions.net/uploads/1/3/0/6/130639173/a3b0f6b845f6c.pdf
    • http://emilywaldrum.com/uploads/1/3/0/6/130640218/02f5f63bc.pdf
    • http://annieholdencoaching.com/uploads/1/3/1/4/131454501/lugilubetopiko-kalalojugaz-xifurotobigi.pdf
    • http://ozteachthailand.com/uploads/1/3/0/8/130874039/vajevuzukumen.pdf
    • http://wolfecityreunion.com/uploads/1/3/0/4/130488412/5910666.pdf
    • http://wildferncollective.com/uploads/1/3/0/6/130621836/16b88b5822d.pdf
    • http://cfranklinplanning.com/uploads/1/3/0/5/130550706/3ff230415f9fe.pdf
    • http://gwl-services.net/uploads/1/3/0/5/130544938/8914246.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_off0000645f.bin
56a74121134241f8d3d5219c669253510ee0390e3db76d5ebf79f9960fa363e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x645F 7712 bytes

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